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Thermostat Installation & Repair in the San Fernando Valley
Your thermostat tells your heating and cooling system when to run. Valley HVAC Network connects homeowners with independent, licensed local HVAC contractors who replace, install and troubleshoot thermostats across the San Fernando Valley, from Sherman Oaks and Encino to Northridge and Sylmar.
Signs Your Thermostat Needs Attention
- Blank or flickering screen, even after new batteries
- The AC or heat won’t turn on, or won’t shut off
- The display doesn’t match how the room feels, so you keep changing the setting
- The system turns on and off every few minutes (short cycling)
- An old dial or mercury thermostat that’s hard to read and set
Upgrading to a Smart Thermostat
A smart or programmable thermostat can follow a schedule, so you’re not cooling an empty house on a hot Valley afternoon. Before you buy one, a few things matter:
- Power (the C-wire): most smart thermostats need a “common” wire for steady power. Many older homes don’t have one, and a tech can add a wire or an adapter.
- Your system type: heat pumps and two-stage systems are wired differently, and the thermostat has to be set up to match.
- Electric baseboard or wall heaters: these use high-voltage thermostats that a standard smart thermostat can’t replace.
- Wi-Fi: you need a reliable signal where the thermostat goes if you want to control it from your phone.
- Rebates: your utility may offer a rebate on qualifying smart thermostats, so check before you buy.
How a thermostat upgrade goes
Here’s a real thermostat replacement by a licensed tech, from the old unit to the new one powered on.
Quick Checks Before You Call
- Mode and setting: make sure it’s on Cool or Heat, and the set temperature is below the room temperature for cooling or above it for heating.
- Batteries: replace them if your thermostat uses them.
- Power: check the breaker for your furnace or air handler, and the furnace power switch, which often looks like a light switch.
- Furnace door: make sure the panel is closed tight. Many systems won’t run if it isn’t.
- Air filter: a badly clogged filter can make it seem like the thermostat isn’t working.
Placement Matters
A thermostat in direct sun, near the kitchen or next to a drafty door reads the wrong temperature, so your system runs too much or too little. A contractor can move it to an inside wall where it reads the house accurately.
Common Questions
Can I install a smart thermostat myself?
Many people do, but it’s easy to miss a wire, and some systems need a C-wire or special setup. Always turn off power at the breaker first. If your wiring doesn’t match the instructions, a licensed tech can finish the job and make sure your system runs correctly.
What do I do with an old mercury thermostat?
Don’t throw it in the trash. Thermostats with a small glass mercury bulb are household hazardous waste in California, so take it to a hazardous waste drop-off, like an LA Sanitation S.A.F.E. center or an LA County collection event.
Will a new thermostat lower my bills?
It can, especially if you use a schedule or let it raise the temperature when you’re away or asleep in summer. How much you save depends on your home and habits.
What Happens When You Call
- Tell us what’s going on, whether it’s a thermostat that stopped working or an upgrade, and where you’re located
- We connect you with an independent, licensed HVAC contractor who services your neighborhood
- They diagnose, repair or quote the job directly with you
Related articles
- How Your AC Works (and Why It Stops Cooling)
- AC Repair in the San Fernando Valley
- Furnace Repair in the San Fernando Valley
Valley HVAC Network is a referral service, not an HVAC contractor. Learn more about how this works →
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