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Find Thermostat installers and replacers in Ontario

Avatar for Trinity Heating and AC
Trinity Heating and AC
5.0(
37
)

Serving Ontario, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2021

Free estimates

Warranties offered

"Trinity Heating installed a new thermostat in my house. The technician, Jimmy, was professional and courteous. After the installation he took the time to explain to me how to set up and use the new thermostat. I’m completely satisfied with their service and will use them again if needed."
Furnace Before
AC After
Furnace After
AC Before
Before - Furnace

+83

Response time3 hrs
Response rate98%
49 neighbors recently requested a quote
Avatar for SO CAL BOYS HEATING & AIR INC
SO CAL BOYS HEATING & AIR INC
5.0(
51
)

Serving Ontario, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2022

Free estimates

Emergency services offered

"George and his crew replaced my 27-year-old heater and A/C, and did an amazing job! The job included putting in a new digital thermostat. They even completely lined the inside of the little shed that houses the heater with insulation — which it never had before. They completed this big project in just a single day! I am extremely happy and satisfied with the work and highly recommend this company! "
2 ton condenser
2 ton furnace
Response time2 hrs
Response rate99%
37 neighbors recently requested a quote
Avatar for RS Air Conditioning & Heating
RS Air Conditioning & Heating
5.0(
21
)

Serving Ontario, CA and surrounding areas

Approved

In business since 1990

Free estimates

Emergency services offered

"Ray is very professional, and provided options for my air conditioning unit replacement. Ray went out of his way to replace a small gas line leak that he found. He also drove to Anaheim early on Saturday morning to pick up a part that was needed for the AC unit, and came over to install it so that I would have the air conditioner available for the upcoming heat wave this week. He and his team were on time, and considerate during the installation process. I highly recommend RS Air Conditioning & Heating."
New Outdoor Install
Furnace Install
Satisfied Client
Energy saver!
Carrier Water Soure

+2

Response time3 hrs
Response rate100%
Recommended by100%of homeowners
Avatar for SOCAL AIR QUALITY HEATING AND AIR
SOCAL AIR QUALITY HEATING AND AIR
5.0(
18
)

Serving Ontario, CA and surrounding areas

Approved

In business since 2024

Free estimates

Emergency services offered

"We have been trying to get an AC unit for the longest especially with this heat and iâ m so thankful i came across socal air quality. The installation and the whole process went very smoothly thanks to Pedro. I received a very affordable pricing and would definitely recommend the quality + the customer service."
System Replacement
System Replacement
Replacement
Open Space
Open

+9

Response time2 hrs
Response rate96%
Recommended by94%of homeowners
Avatar for Penguin Heating and Air Inc
Penguin Heating and Air Inc
5.0(
14
)

Serving Ontario, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2025

Free estimates

Emergency services offered

"They answered my request quickly and David the technician came to my home to check a problem with my outside unit as it wasn?t turning on, within minutes he figured it out gave me some options and had me cooling again right away! Thank you."
Diamond Bar
Diamond Bar
Diamond Bar
Furnace Install
AC Condenser

+6

Response time2 hrs
Response rate100%
7 neighbors recently requested a quote
...
Showing 1-10 of 1464
FAQs for thermostat installation and replacement projects in Ontario, CA

Smart thermostats may be worth it for many homeowners. They come with various features, including voice control and smartphone apps. Vacation mode can help lower energy usage when you’re out of town for an extended period. Alert warnings let you know about major spikes or drops in temperature. Smartphone apps can track energy usage, and smart thermostats can learn your routine over time to adjust your temperature and reduce wasted energy consumption automatically.

You typically do not need more than one smart thermostat. While it’s common to see multiple mechanical thermostats throughout a large home, multiple smart thermostats may try to override each other. This can lead to problems with the HVAC system. Ensure the unit you buy has the option for dual- or multi-zoned systems to avoid compatibility issues.

Installing a programmable or smart thermostat may save you $180 per year in utility costs. A big part of this comes from a smart thermostat’s ability to learn and adapt to your regular routines. With smartphone apps or web-based interfaces, you also have the option to control your thermostat when you’re not home.

The Ontario, CA homeowners’ guide to thermostat installations and replacements

From average costs to expert advice, get all the answers you need to get your job done.