CLAP Plumbing Heating & Cooling has been serving Los Altos and the wider Santa Clara County area since 2004. For more than two decades, homeowners, landlords, property managers, and businesses across the Bay Area have called us when their heating or cooling system needs attention. We handle the full range of residential and commercial HVAC work: AC repair and service, heating and furnace repair, heat pump installation and service, full system replacement, ductwork repair and sealing, thermostat and smart-control installation, indoor air quality upgrades, seasonal maintenance, and emergency calls when a system goes down without warning. We live and work in this community, and our work shows it. Every job gets qualified HVAC technicians on-site, ready to diagnose the problem and get your system running right. Good workmanship. Good pricing. Good technicians.
Your home deserves heating and cooling that runs right, and so does every commercial property you manage. Below is a look at the core services we provide across Los Altos and the surrounding area.
When your air conditioner stops cooling or starts behaving strangely, we come out and find the cause. A typical visit covers refrigerant leak checks, condenser and compressor inspection, evaporator coil condition, and airflow troubleshooting. Whether the system has stopped working completely or is just struggling to keep up, we diagnose the issue and walk you through the repair. Call us and we'll walk you through your options.
A furnace that quits in the middle of a cold snap is not something you want to wait on. We inspect the heat exchanger, ignition and burner assembly, blower performance, and airflow through the system. If you have no heat or a furnace that keeps cycling off, we move quickly to get the situation resolved. Same-day availability applies on many heating calls.
Heat pumps handle both heating and cooling, which means a problem with one affects comfort year-round. We check refrigerant levels, inspect the reversing valve, evaluate air handler performance, and run a seasonal performance check to make sure the system is doing what it should. If your heat pump is not keeping up or has stopped working, give us a call and we will get the comfort back.
At some point, repairing an aging system costs more than replacing it. We size the new equipment to your space, help you select the right unit, remove the old system, and complete the installation from start to finish. Every installation is code-compliant HVAC work on every job, and we handle the thermostat setup before we leave.
Leaky ducts waste energy and create uneven temperatures from room to room. We diagnose airflow problems, seal duct leaks, and rebalance the system so conditioned air reaches every part of the building the way it should. If some rooms are always too hot or too cold, the ductwork is often the place to start.
A thermostat that is not reading temperatures accurately or responding properly can throw off the whole system. We replace faulty thermostats, install smart thermostats, and handle programming and integration so the new control works with your equipment from day one. A properly calibrated control saves energy and removes the guesswork from your comfort settings.
We install whole-home air filtration systems, upgrade existing filters to higher MERV ratings, and add air purifiers where the situation calls for it. If allergens, dust, or smoke infiltration are affecting the air inside your home or building, we can assess what the system needs and get the right equipment in place. One call brings a technician to your door.
A full tune-up covers system inspection, cleaning, refrigerant check, safety checks, and filter service. Staying ahead of problems with regular maintenance extends equipment life and keeps efficiency up through the seasons. We service both residential systems and commercial equipment on a schedule that works for you.
We built this business around HVAC work like this, and emergency calls are no exception. When a system goes down and you have no heat, no cooling, or a complete failure, we move quickly to get a technician on-site. We show up on time and ready to work, with the tools and parts to handle the most common failures on the first visit. We do not ask you to wait days for an appointment when the situation is urgent. We answer the phone. We dispatch the technician. We keep it simple.
The Bay Area has long enjoyed mild temperatures that made air conditioning feel optional for most households. That is changing. Recent record heat events have pushed summer temperatures well above what older homes were designed to handle, and wildfire smoke seasons now affect air quality across Santa Clara County on a regular basis. At the same time, California's push toward all-electric homes has made heat pump systems the practical path forward for many property owners. These three services come up constantly in our work here, so we want to explain what each one involves.
A large share of Los Altos homes were built during decades when central air conditioning was not standard. Many still do not have it. For those homes, a ductless mini-split system is often the most practical solution. Mini-splits do not require existing ductwork, they can be zoned by room or area, and they run efficiently in the Bay Area's climate. We handle system selection, installation, and setup so you get the right capacity for your space and the comfort control you want. Interest in first-time cooling installations has grown sharply after recent heat events, and we are ready to help you get ahead of next summer.
Wildfire smoke carries fine particulates that standard HVAC filters are not designed to stop. A MERV-13 or higher rated filter upgrade gives your system the ability to capture a much greater share of those particles before they circulate through the home. We assess your existing system, recommend the right filtration upgrade, and install it correctly so airflow is not compromised in the process. For homes and commercial buildings where air quality is a real concern during smoke season, this is a practical, lasting improvement, not an upsell.
California's energy direction is clear, and heat pump systems are at the center of it. A modern heat pump handles both heating and cooling in a single system, replacing a gas furnace and a separate air conditioner with one efficient unit sized for the Bay Area's climate. We evaluate your home or building, recommend the right system, and complete the installation from removal of the old equipment through final setup. For property owners ready to move away from gas heating, a heat pump installation is the most effective way to do it.
We work with all types of customers across the area. For homeowners, that means comfort, reliability, and transparent pricing with no hidden fees on any HVAC job. For landlords and property managers, it means responsive service on multi-unit properties, rental homes, and commercial spaces where a system failure affects tenants and operations. We also serve office buildings, retail spaces, and light commercial properties that need regular maintenance and fast repair when something goes wrong. Whatever the property type, we treat every job with the same care and attention. We'll get your comfort back on track.
Getting your comfort problem handled starts with a quick call. When you reach us, you are reaching a locally owned operation that has been doing this work in Los Altos since 2004. Over 22 years, we have built a reputation for showing up when we say we will and doing the job right. Every visit is handled by qualified HVAC technicians who know the equipment and take the work seriously. We are proud of the work we do, and we stand behind it.
We know schedules shift, so we keep your booking flexible, and we apply the same straightforward approach to pricing. Before any work begins, we tell you what the job involves and what it will cost. There are no surprises added after the fact. We protect your floors and finishes while we work, and we leave the space clean when the job is done. If you want to know what a repair or installation is likely to cost, the right move is to call for a quote. We will give you a clear picture of what the job involves and what you can expect to pay.
We are based in Los Altos and serve customers throughout Santa Clara County and the surrounding communities. Our regular service area includes Mountain View, Sunnyvale, Cupertino, Palo Alto, Los Altos Hills, Menlo Park, Santa Clara, and Saratoga. If you are nearby and need HVAC service, there is a good chance we are already working in your neighborhood. Not the biggest outfit in town. Just the most reliable. Always on time.
The technician starts with a full diagnostic inspection of the system, checking the key components based on the symptoms you described when you called. Once we know what the problem is, we walk you through the findings and give you a clear estimate before any repair work begins. After the repair, we test the system to confirm it is running correctly before we leave.
For homes without existing ductwork, a ductless mini-split is often the most practical path to whole-home cooling and heating. We assess your space, recommend the right system capacity, and handle the full installation, which includes mounting the indoor air handler, placing the outdoor unit, and connecting the refrigerant lines. The result is a zoned, efficient system that does not require any duct runs through the home.
A heat pump moves heat rather than generating it, which allows it to provide both heating and cooling from a single outdoor unit connected to an indoor air handler. In cooling mode it works like a standard air conditioner; in heating mode it reverses the process and pulls heat from the outdoor air into the home. For the Bay Area's mild winters, a heat pump handles the heating load efficiently without the fuel cost of a gas furnace.
A standard HVAC filter is rated to capture larger particles like dust and pet dander, but it is not designed to stop the fine particulates found in wildfire smoke. A MERV-13 or higher filter captures a much greater share of those smaller particles before they circulate through the home. We assess your existing system before upgrading the filter to make sure airflow is not restricted in the process.
Common signs include a furnace that cycles on and off frequently without reaching the set temperature, one that produces little or no heat, a burning smell from the vents, or unusual noises like banging, rattling, or a loud ignition. An aging furnace that has needed multiple repairs in recent seasons is worth evaluating for replacement. We give you an honest assessment of whether a repair or a replacement makes more sense for your situation.
Banging or clanking usually points to a loose or broken component inside the unit, such as a blower fan blade or a failing motor mount. Squealing often indicates a worn belt or bearing. Rattling can mean debris in the system or a loose panel. Any of these sounds are worth investigating before they lead to a larger failure.
A burning smell at the start of the heating season is sometimes dust burning off the heat exchanger after months of sitting idle, but a persistent burning smell can indicate an electrical issue within the equipment or a failing component. A musty smell often points to mold or mildew growth inside the ductwork or on the evaporator coil. Both situations are worth having a technician look at.
When a system is more than 15 years old, has needed repeated repairs, or when the cost of the next repair approaches a significant share of what a new system would cost, replacement is usually the better investment. A new system also runs more efficiently, which reduces monthly energy costs over time. We walk you through the comparison honestly so you can make the decision that makes sense for your budget.
If the diagnostic shows the system is at the end of its useful life, we explain what we found and give you a clear picture of your replacement options before any additional work is authorized. We do not proceed with a replacement without your approval. Once you decide to move forward, we schedule the installation and handle removal of the old equipment as part of the job.
At the air handler, we inspect the blower motor and wheel, the evaporator coil condition, the drain pan and condensate handling, the filter, and the electrical connections to the unit. We also check airflow through the system and compare return and supply air temperatures to confirm the system is performing within spec. Any problems found are explained before repair work begins.
After any repair or installation, we run the system through a full operating cycle and verify that it is producing the correct heating or cooling output. We check airflow at the vents, confirm the thermostat is communicating correctly with the equipment, and make sure there are no error codes or warning indicators active. We do not consider the job done until the system is confirmed to be running properly.
As components age, they work harder to deliver the same output. A dirty heat exchanger, a worn compressor, low refrigerant, or degraded insulation on refrigerant lines all reduce efficiency over time. The system runs longer cycles to reach the set temperature, which increases energy consumption. A tune-up can recover some of that efficiency; at a certain age, replacement recovers the rest.
Additional charges come from parts and labor required to complete the repair beyond the initial diagnostic. If a repair requires a component that needs to be ordered, or if the job turns out to be more involved than initially apparent, we explain the updated scope and cost before proceeding. Nothing is added to the invoice without your knowledge and approval first.
CLAP Plumbing Heating & Cooling is ready to take your call. Whether you need a same-day repair, a system replacement quote, or a seasonal tune-up scheduled at your convenience, we are here to help. Call (650) 955-4592 and we will get a technician out to your property. We answer the phone. We dispatch the technician. We keep it simple.
We handle the full range of residential and commercial heating and cooling work in Los Altos and across Santa Clara County. Whether you need a same-day repair, a seasonal tune-up, or a full system replacement, our qualified technicians show up on time with the tools to get the job done right. Every service comes with a clear estimate before work begins and transparent pricing with no hidden fees. Browse the table below to find the service that fits your situation, then call us for a quote.
| Service | What It Covers | When You Need It | Helpful Details |
|---|---|---|---|
| Thermostat & Smart-Control Installation | programmable thermostat installation, Wi-Fi smart thermostat setup, zoning control installation, thermostat diagnostics and replacement | anyone who wants better control over comfort and energy use without a full system change | A smart thermostat upgrade is one of the fastest ways to improve system efficiency and comfort. |
| Heat Pump Electrification | heat pump installation replacing gas furnace and AC, residential and commercial heat pump replacement, system performance guidance for the Bay Area climate, qualified technician installation throughout | Los Altos homeowners and landlords moving away from gas heating or replacing aging dual systems | With mild winters in the area, heat pumps are a strong fit and handle both heating and cooling efficiently from a single system. |
| Emergency HVAC Service | same-day no-heat and no-cool response, weekend and urgent call availability, rapid diagnostics on arrival, first-visit repair when parts allow | any situation where the system has stopped working and waiting is not an option | We take emergency calls seriously and dispatch technicians prepared to diagnose and repair on the first visit. |
| Heat Pump Repair & Service | heating and cooling mode diagnostics, refrigerant and coil service, defrost cycle checks, seasonal tune-ups | homes with a heat pump that is not heating, not cooling, or cycling too often | Because heat pumps handle both seasons, a problem affects year-round comfort, so prompt service matters. |
| AC Repair & Service | refrigerant diagnosis, evaporator and condenser coil service, compressor and capacitor checks, same-day repair availability | homeowners or businesses with an AC that is not cooling or is short-cycling | Most AC repairs can be diagnosed and completed in a single visit when parts are on hand. |
| Heating & Furnace Repair | gas furnace diagnostics, emergency no-heat response, igniter and heat exchanger inspection, furnace tune-up and maintenance | any home or building that has lost heat or is heating unevenly | Same-day furnace repair is available for urgent no-heat situations throughout the area. |
| Seasonal Maintenance & Tune-Ups | refrigerant level check, coil cleaning, filter replacement, controls and safety testing | any homeowner or property manager who wants to extend equipment life and avoid emergency calls | Annual maintenance helps keep manufacturer warranties intact and catches small problems early. |
| First-Time AC & Ductless Cooling Installation | ductless mini-split sizing and installation, central AC installation for ducted homes, zoned cooling setup, code-compliant installation throughout | Los Altos homes built without central air conditioning or existing ductwork | Mini-split systems deliver efficient zoned cooling and heating with no duct runs required, making them the practical choice for older Bay Area homes. |
| Ductwork Repair & Sealing | duct leak inspection, duct sealing and repair, full duct replacement, airflow balancing | homes with uneven temperatures, high utility bills, or visible duct damage | Leaking ducts can waste a significant portion of conditioned air before it ever reaches the living space. |
| Wildfire-Smoke Air Filtration (MERV-13+) | MERV-13 and higher filter upgrades, whole-home air scrubber installation, UV air purifier installation, system compatibility assessment | households that want cleaner indoor air during wildfire smoke events and year-round | Standard HVAC filters are not rated to capture the fine particulates in wildfire smoke; a MERV-13 or higher upgrade addresses that gap. |
| Indoor Air Quality & Air Filtration | whole-home air purifier installation, air scrubber and UV purifier installation, advanced filter upgrades, whole-home humidifier installation | households concerned about allergens, dust, wildfire smoke, or dry indoor air | Improved filtration is especially relevant during wildfire smoke season across the Bay Area. |
| Full System Installation & Replacement | central AC installation, furnace and heat pump replacement, complete HVAC system sizing and install, code-compliant work on every job | homeowners or property managers whose existing system is aging, failing, or beyond repair | Most full system replacements are completed in a single day by our qualified HVAC technicians. |
How do I know if my HVAC system needs repair or full replacement?
Age and repair history are the two biggest factors. If the system is more than 15 years old and has needed multiple repairs in recent seasons, replacement is often the more cost-effective path. A system that struggles to maintain temperature, runs constantly, or is producing noticeably higher energy bills is working harder than it should. We give you an honest assessment of the system's condition and walk you through what the options look like before any decision is made.
What are the signs of a refrigerant or airflow problem?
Warm air coming out when the AC is running, ice forming on the evaporator coil, a system that runs but never quite cools the space, and unusually high energy bills are all common signs. Weak or uneven airflow from the vents can point to a duct problem, a dirty coil, or a failing blower. These issues do not improve on their own, so calling sooner rather than later usually limits the damage.
How often should I schedule HVAC maintenance?
Once a year is the standard recommendation for most systems. A spring tune-up before cooling season and a fall tune-up before heating season is ideal if the system handles both. Annual maintenance catches small problems before they become expensive repairs, keeps the equipment running efficiently, and helps maintain manufacturer warranty coverage. It is the simplest thing you can do to extend the life of your equipment.
Transparent Upfront Pricing
Before any repair or installation begins, we give you a clear estimate so you know exactly what the work costs and why. There are no hidden fees and no surprise charges added after the fact.
What does a seasonal tune-up actually include?
We check refrigerant levels, clean the evaporator and condenser coils, inspect and replace filters, test all controls and safety switches, check electrical connections on the equipment, and verify that the system is operating within its rated specifications. We also note anything that looks like it could become a problem before the heavy-use season begins and walk you through what we found.
Why is one room in my home hotter or colder than the rest?
Uneven temperatures usually point to a duct problem, a zoning issue, or equipment that is not properly sized for the space. Leaking or disconnected ducts can redirect conditioned air before it reaches certain rooms. A thermostat in the wrong location can also cause the system to cycle off before the whole home reaches the set temperature. We diagnose the root cause rather than guessing, so the fix actually addresses the problem.
What can strange noises from my HVAC unit mean?
Banging or clanking often points to a loose or broken component inside the unit. Grinding can indicate a failing motor bearing. Squealing sometimes means a belt or blower issue. A clicking sound that continues after startup can point to a control or relay problem. Any noise that is new or getting worse is worth a call, since running a system with a mechanical problem usually leads to more extensive damage over time.
Same-Day and Emergency Availability
When the heat goes out or the AC fails, we respond quickly. Same-day service is available for urgent situations throughout Los Altos and Santa Clara County.
How does a dirty filter or coil affect system performance?
A clogged filter restricts airflow, which forces the blower to work harder and reduces the amount of conditioned air reaching the living space. Over time, restricted airflow causes the evaporator coil to ice over, which shuts down cooling entirely. A dirty coil cannot transfer heat efficiently, so the system runs longer cycles and uses more energy to reach the same result. Keeping filters clean and scheduling annual coil cleaning are two of the most effective ways to protect the equipment.
What is involved in a thermostat or smart-control upgrade?
We remove the existing thermostat, verify that the wiring at the wall is compatible with the new unit, and install and configure the replacement. For Wi-Fi smart thermostats, we connect the device to the home network and walk you through the basic settings. Zoning controls involve additional hardware and a bit more setup time, but the process is straightforward. In most cases, a thermostat swap is completed in under an hour.
Code-Compliant Work on Every Job
Every installation and repair we perform meets current code requirements. Our qualified HVAC technicians handle the work correctly the first time, with no shortcuts.
Do I need to be home when the technician arrives?
For repairs and installations, yes. Someone needs to be present to provide access to the equipment and to review what we find before any work begins. We do not start repairs without your approval. If your schedule is tight, call us and we can talk through how to handle access. We keep scheduling flexible and operate from 5:30 AM to 10:30 PM daily to work around your hours when we can.
What causes a system to short-cycle?
Short-cycling, where the system starts and stops more frequently than it should, is often caused by an oversized unit, a refrigerant problem, a dirty filter, or a failing thermostat. An oversized AC cools the space too quickly, shuts off before completing a full cycle, and then restarts shortly after. This puts extra wear on the compressor and reduces the system's ability to control humidity. We diagnose the specific cause before recommending a fix.
Is same-day or emergency service available for a system that has completely stopped working?
Yes. We offer same-day availability for no-heat and no-cool situations throughout Los Altos and the surrounding area. Our technicians arrive prepared to diagnose and, in most cases, repair on the first visit. Calling early in the day gives you the best chance of a same-day appointment, especially during peak heating and cooling seasons. We take these calls seriously and respond as quickly as we can.
Every home and building is a little different, so call us at (650) 955-4592 and we will give you honest, straightforward advice based on your specific system and situation.
(650) 955-4592