Professional Thermostat Installation & Repair
Installation, troubleshooting, and smart thermostat upgrades for better control over your comfort.
Better Control Starts With the Right Thermostat
A thermostat that's outdated, miscalibrated, or not communicating properly with your system can throw off your comfort and waste energy without you realizing it. We install and repair thermostats so your system responds the way it should.
Whether you're upgrading to a smart or programmable thermostat or troubleshooting one that isn't working right, we make sure it's set up correctly and compatible with your existing HVAC system.
- Upfront pricing
- Licensed & insured technicians
- Same-day appointments available
What We Handle
Common thermostat installation and repair needs.
Smart Thermostat Installation
We install and set up smart and programmable thermostats compatible with your system.
Calibration & Accuracy Issues
A thermostat reading the wrong temperature can throw off your entire system's performance.
Wiring & Compatibility Issues
We troubleshoot wiring and compatibility problems between your thermostat and HVAC system.
Controls & Programming
If your thermostat isn't communicating with your system, we'll diagnose and fix it.
System Tune-In
After installation, we confirm the thermostat is properly controlling your heating and cooling.
What to Expect
A simple, transparent process from your first call to a working thermostat.
- 1
Call or Book Online
Reach out by phone or request service online — whichever is easier for you.
- 2
Diagnosis
A technician checks your current thermostat and its compatibility with your system.
- 3
Clear Options
You get a straightforward explanation of your options and an upfront price before any work starts.
- 4
Installation or Repair
We install the new thermostat or repair the existing one.
- 5
Final Check
We test the thermostat with your system to confirm everything is working correctly.
Why Choose Trust Heating & Air Conditioning
We're a local HVAC company that treats every home and business like it's our own — straightforward pricing, careful work, and technicians who take the time to do the job right.
Free Estimates
We provide free estimates on new installations and system replacements, so you know your options before committing to anything.
Same-Day Service
Comfort emergencies don't wait, so neither do we — same-day appointments available.
Financing Available
Flexible financing options are available for qualifying installations and larger repairs.
2-Year Labor Warranty
Every installation and repair is backed by a 2-year labor warranty for your peace of mind.
Residential & Commercial Expertise
From single-family homes to commercial properties, we bring the same standard of care.
All Major HVAC Brands
We install and service all major HVAC brands, including Carrier, Lennox, Trane, Daikin, Goodman, American Standard, and AC Pro.
Honest Service
You'll know the cost before any work begins — no surprises, no pressure to upsell.
Local Team
We're a local team serving West Covina, Los Angeles County, and San Bernardino County — not a call center.
Serving West Covina & Nearby Communities
We're based in West Covina and regularly serve communities throughout Los Angeles County and San Bernardino County. Depending on scheduling and the scope of the job, we sometimes take on projects further out too — if you're not sure whether we cover your area, give us a call and we'll let you know.
Thermostat Questions
Can you install a smart thermostat?
Yes, we install smart and programmable thermostats and make sure they're compatible with your existing system.
Will a new thermostat work with my current HVAC system?
Most thermostats are compatible with common residential systems, but we check compatibility before installation to be sure.
My thermostat isn't turning on my system. What's wrong?
This can be a wiring, power, or compatibility issue. We diagnose the cause before recommending a repair or replacement.
How much does thermostat installation cost?
Cost depends on the thermostat and the scope of the work. We give you a clear price before any installation begins.
Can you install a smart thermostat?
Yes, we install smart and programmable thermostats and make sure they're compatible with your existing system.
Will a new thermostat work with my current HVAC system?
Most thermostats are compatible with common residential systems, but we check compatibility before installation to be sure.
My thermostat isn't turning on my system. What's wrong?
This can be a wiring, power, or compatibility issue. We diagnose the cause before recommending a repair or replacement.
How much does thermostat installation cost?
Cost depends on the thermostat and the scope of the work. We give you a clear price before any installation begins.
Ready to Get Started with Thermostats?
Whether it's a small repair or a full system replacement, our team is ready to help — with honest pricing and no pressure.
- Licensed & Insured
- Same-Day Service
- Residential & Commercial