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Top-Rated Thermostat installers and replacers in Modesto - Updated Nov 2026

Avatar for Cosmic Comfort
Cosmic Comfort
4.8(
97
)
Thermostat - Install or Replace

Serving Modesto, CA and surrounding areas

Approved

In business since 2018

Free estimates

Emergency services offered

Cosmic Comfort is a locally owned HVAC, electrical and solar company serving the Central Valley since 2015, from Modesto and Turlock to Merced, Atwater and Fresno. Our licensed team (CA C-10 and C-20, #1015082) handles AC and furnace repair and replacement, heat pumps, panel upgrades, rewires, EV chargers and solar with batteries. We're Tesla Certified for chargers and Powerwall. You get upfront pricing before any work starts, free estimates, flexible financing options and same-day service most weekdays. Every repair comes with a 1-year labor warranty, and every install with a 2-year labor warranty. You can reach us 24/7 to schedule. Join Cosmic Care for year-round maintenance and priority service.

Rooftop crane lift
Subpanel wiring
Team with van
Condenser and van
Rooftop wiring

+8

26 neighbors recently requested a quote
Recommended by94%of homeowners
Avatar for The Air Doctor Heating & Air
The Air Doctor Heating & Air
4.8(
34
)
Thermostat - Install or Replace

Serving Modesto, CA and surrounding areas

Approved

In business since 2020

Free estimates

Emergency services offered

"Sam the Air doctor took time out of his very busy schedule to come and help me out with my thermostat. It took him seconds to figure out what the problem was with it. Not only he fixed the problem right away but also gave me advice on how to keep my ac unit working the way it should. His prices are very fair. Never felt like he was charging more than what he should for his work. From now and on we will call anyone else. All we need is our Air Doctor. Very happy client over here. Thank you again."
Response time7 hrs
1 neighbors recently requested a quote
Recommended by93%of homeowners
Avatar for NorCal Handyman
NorCal Handyman
4.9(
38
)
Thermostat - Install or Replace

Serving Modesto, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2013

Free estimates

Emergency services offered

"Juan was very professional, polite, honest and extremely flexible while he helped us with the gutters and drains. The project turned out to be much more complicated than he expected but he kept his word and honored the agreement. He is the definition of going above and beyond to get the job done- correctly. We will definitely be reaching to him again for another larger project that we have coming up. Recommend him a million percent!"
Handyman Services Project
Additional Photos
Additional Photos
Additional Photos
Weather head is the pipe above the roof showing the conductors exposed aluminum do to heat and weather. These conductors connect to pg@e power lines.

+33

Response time1 day
1 neighbors recently requested a quote
Recommended by84%of homeowners
Avatar for AJAX Heating & Air Conditioning
AJAX Heating & Air Conditioning
5.0(
11
)
Thermostat - Install or Replace

Serving Modesto, CA and surrounding areas

Approved

Free estimates

Emergency services offered

Warranties offered

"Ken was amazing. He evaluated our equipment, installed new heating and air systems, linked the thermostat, and came back to be sure we were comfortable with the system and how to use it. And to be sure we were comfortable with the temperature! His attention to detail, service, and understanding our needs is exactly what makes us recommend AJAX to friends, too. Thanks, Ken!"
Gas/Pack W/ Ductwork
Gas/Pack W/ Ductwork
Down Flow Furnace
Down Flow Furnace
Upflow Furnace

+2

16 neighbors recently requested a quote
Avatar for Jets Electrical Installation, Inc.
Jets Electrical Installation, Inc.
1.0(
2
)
Thermostat - Install or Replace

Serving Modesto, CA and surrounding areas

Approved

In business since 2007

Emergency services offered

Warranties offered

With almost 18 years of experience serving the area, we are your solution for all your electrical needs. We take great pride in our extreme professionalism, timeliness and superior customer service on every job. We make sure to develop a lasting relationship so that the next time service is needed there will be no question on whom to call. Check out our 5-star reviews from happy customers! Call us today so we can discuss your needs and make a plan that fits your budget. Satisfaction guaranteed!

HVAC REPLACEMENT & REPAIR
ELECTRICAL PANEL
PLUMBING
Response time2 days
8 neighbors recently requested a quote
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FAQs for thermostat installation and replacement projects in Modesto, 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 Modesto, 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.