Tired of hot upstairs rooms and a system that runs nonstop? We diagnose what's actually wrong, explain your options honestly, and deliver lasting comfort across Castro Valley.
A house with no cooling in summer or no heat in winter can't be put on hold, so we don't. We send experienced technicians out for same-day visits and repairs built around how these systems actually fail in our local homes.
We take on the full range of comfort problems, from failed capacitors and cracked heat exchangers to ductless installs and commercial rooftop units, with the hands-on experience the job calls for.
Heating systems of every type repaired and tested before we leave.
New HVAC systems, sized, sealed, and commissioned the right way.
New furnaces installed with proper venting, gas work, and a full startup test.
Honest repair-or-replace advice, and clean changeouts when it's time.
Repairs for any heating or cooling system, diagnosed with real testing instead of guesswork.
Year-round heating and cooling from one efficient system.
Targeted comfort for additions, garages, and rooms the ducts never reached.
Coils cleaned, charge checked, safeties tested, twice a year.
Efficient AC systems, correctly sized and installed to last.
Dust, odors, and weak airflow traced back to the ductwork and fixed.
Gas and electric furnace repairs with combustion and safety checks included.
Cold air back fast, with the common parts already on the truck.
Taking calls now·Speak with someone about your HVAC needs
Two systems do most of the work in a typical home, and they're the two we repair most. Here's what to expect when you call.
When your AC hums but won't cool, blows warm air, or keeps tripping the breaker, the fix is usually a single worn component. We test the system, find it, and replace it, often the same day. You get a clear price before any work starts, and if the system is old enough that replacement makes more sense, we'll show you both numbers.
A furnace that won't light on a cold night can't wait until morning. Most no-heat calls come down to a dirty flame sensor, a failed igniter, or a blower motor, and our trucks carry the common parts to fix them on the spot. Every visit includes a safety check of the burners and venting, and you'll know the price before we start.
HVAC trouble rarely announces itself politely. If you're facing any of these problems, contact our team right away for expert help.
Low refrigerant, a failed compressor start, or a dirty condenser can all masquerade as the same symptom. Real diagnosis beats parts-swapping every time.
AC repairIf the blower runs but the air never warms, or the unit clicks without lighting, the failure is diagnosable in minutes with the right tools.
Furnace repairEnergy bills creeping up while comfort drops means the system is working harder than it should, dirty coils, clogged filters, or failing motors are the usual suspects.
Maintenance & tune-upsA system past 12 to 15 years that needs a repair every season is telling you something. We'll give you the honest math on repair versus replacement.
System replacementYour ducts move the same air thousands of times a day. Years of dust, dander, and construction debris ride along until they're cleaned out.
Air duct cleaningAdditions and bonus rooms rarely get enough duct capacity. A dedicated ductless head fixes the problem permanently.
Mini-split installationAn HVAC system never fails at a convenient time. We schedule fast, show up on time, and arrive with the parts to finish the job.
Experience is what separates a lasting fix from a temporary one. Our technicians have spent years reading these systems, refrigerant behavior, combustion, airflow, electrical faults, and matching the repair to the actual cause.
Plenty of companies sell a new system the moment yours hiccups. We diagnose first, explain what actually failed, and only recommend replacement when the math genuinely favors it.
Installations get the full treatment, real load calculation, correct line sets, sealed and balanced ductwork connections, and a complete commissioning test before we leave.
Year after year, Castro Valley HVAC has been the team local families call when the AC quits or the furnace goes cold. We've serviced systems in nearly every neighborhood around town, and that track record shapes how we approach each job, from the first diagnostic to the final test.
Anyone can bolt in a condenser. Lasting comfort comes from understanding the home and the system together, and that's where our years working in this area pay off, fewer callbacks, faster fixes, and installs that pass inspection without drama.
Call a local HVAC expert. Upfront pricing, no obligation.
From the first call to the final airflow check, our method is built to solve the problem completely the first time.
Call (510) 201-4777 and we'll get you a price quote, often within a day. A few quick questions, cooling or heating, what the system is doing, how old it is, and we'll book a time that works for you.
We don't guess. The diagnostic covers the full system and turns into a straightforward recommendation with the cost spelled out up front.
We complete the approved work on the spot whenever possible: quality parts, code-compliant connections, and no shortcuts hidden behind the air handler.
We verify temperatures at the vents, check the charge, confirm the condensate drains clear, and walk you through what was done. Optional maintenance plans keep the system cleaned, inspected, and running efficiently for years.
Upfront pricing · Same-day service available
There's no mystery to how we handle an urgent failure. Here's the step-by-step of what we do after a homeowner calls for fast help.
The first call is where it all starts. Someone on our team picks up, works out how urgent the situation is, and schedules the soonest visit available, while telling you the few simple things to do in the meantime.
Often within hours, our fully equipped technician is on-site with the parts and tools required to diagnose and begin the repair in your home or business.
This is where the problem actually gets solved. We repair what's repairable immediately, and when replacement is the honest answer, we handle removal, disposal, and a code-compliant install without drama.
We don't disappear once the visit is done. We follow up to confirm everything is holding, and for systems in their later years we'll suggest the maintenance rhythm that keeps them reliable instead of surprising you.
"Our restaurant's rooftop unit failed on a Friday with a full weekend of reservations booked. Their team got it running the same day. They clearly understood what downtime costs a Castro Valley business, and they came back the next week to fully service the second unit. They've got all our locations now."
"The furnace kept short-cycling, kicking on and off every few minutes and never really warming the house. The technician found a clogged filter had tripped the limit switch and cleaned the flame sensor while he was in there. It's run flawlessly ever since, and he showed me which filter to buy going forward."
"From the estimate to the final walkthrough, the whole install was smooth and organized. The crew wore shoe covers, put down drop cloths, hauled off the old equipment, and the final bill matched the quote to the penny. The new system is so quiet we barely notice it running. Highly recommend."
Choosing who works on your HVAC system is a real decision. Here's what sets us apart from other local service companies.
Real experience is a requirement, not a bonus. It means every technician reads refrigerant and electrical faults correctly, installs to local code, and stands behind every repair at a level most companies don't reach.
Doing it right is built into how we install. We handle the refrigerant, gas, electrical, and airflow details precisely, pull permits where local code requires them, and commission the full system before we call it done, and we tell you what we did and why.
Our team focuses on keeping systems alive with simple, scheduled care. If you want to avoid the emergency replacement, our spring and fall maintenance visits clean coils, verify the charge, and test every safety control. No surprises, no hidden fees. This focus on longevity is why so many homeowners recommend us.
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Call (510) 201-4777 Now
