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Find Thermostat installers and replacers in Fullerton

Avatar for Super Air Heating and Air Conditioning

Super Air Heating and Air Conditioning

4.82(
82
)
•Approved Pro

Super Air Heating and Air Conditioning

4.82(
82
)
•Approved Pro
Customers say: Quick response
Recommended by 97% of Angi customers
Recommended by 97% of HomeAdvisor customers
13 years of experience

We can get your family more comfort year round. We specialize in high, efficient SEER products and we service and install what we sell. Call us today to get your project on the schedule now!

"These guys were excellent. Went above and beyond to make sure everything was working properly. "

Rachael S on June 2025

We can get your family more comfort year round. We specialize in high, efficient SEER products and we service and install what we sell. Call us today to get your project on the schedule now!

"These guys were excellent. Went above and beyond to make sure everything was working properly. "

Rachael S on June 2025

Avatar for SO CAL BOYS HEATING & AIR INC

SO CAL BOYS HEATING & AIR INC

4.96(
49
)
•Approved Pro

SO CAL BOYS HEATING & AIR INC

4.96(
49
)
•Approved Pro
Super Service Award
Customers say: True professional
17 local quotes requested
4 years of experience

We are a locally owned and operated company that values honesty and integrity and treats your home as if it were our own. We offer a variety of General Contractor services that are customizable to each individual project. You will find us to be competitively priced, paying close attention to the details of each and every project that we are involved with. We look forward to building lasting relationships and guarantee your satisfaction!

"George & Earvin came out to diagnose my wall heater and were very helpful from start to finish. Highly recommend you give them a call for any HVAC related needs"

Michael S on December 2025

We are a locally owned and operated company that values honesty and integrity and treats your home as if it were our own. We offer a variety of General Contractor services that are customizable to each individual project. You will find us to be competitively priced, paying close attention to the details of each and every project that we are involved with. We look forward to building lasting relationships and guarantee your satisfaction!

"George & Earvin came out to diagnose my wall heater and were very helpful from start to finish. Highly recommend you give them a call for any HVAC related needs"

Michael S on December 2025

Avatar for Just Chill AC & Heating

Just Chill AC & Heating

5.00(
10
)
•Approved Pro

Just Chill AC & Heating

5.00(
10
)
•Approved Pro
16 local quotes requested
1 years of experience

Just Chill AC & Heating is dedicated to providing our customers with the best quality and craftsmanship. We are here to build relationships with our customers and communities and to provide our employees with a great place to work. We look forward to working with you!

"Chris was everything you ask for in a professional. On time, expertise, and courteous. He wasn't about up selling me about whatever worked for him, he wanted a solution that worked for me and my family. The best part is that he's knowledgeable and kind about what you are looking at short and long term any your machinery. Hire this company."

Brandon C on December 2025

Just Chill AC & Heating is dedicated to providing our customers with the best quality and craftsmanship. We are here to build relationships with our customers and communities and to provide our employees with a great place to work. We look forward to working with you!

"Chris was everything you ask for in a professional. On time, expertise, and courteous. He wasn't about up selling me about whatever worked for him, he wanted a solution that worked for me and my family. The best part is that he's knowledgeable and kind about what you are looking at short and long term any your machinery. Hire this company."

Brandon C on December 2025

Avatar for MSP Heating and Air, LLC

MSP Heating and Air, LLC

4.93(
286
)
•Approved Pro

MSP Heating and Air, LLC

4.93(
286
)
•Approved Pro
Customers say: True professional
Recommended by 95% of Angi customers
Recommended by 95% of HomeAdvisor customers
88 local quotes requested

We at MSP HEATING AND AIR focus on quality HVAC services over quantity. We use our years of experience and expertise, to complete your project with perfection. Customer service and honesty are the most important aspects of our business and your satisfaction is guaranteed! Please call us today for an estimate. We look forward to working with you! we keep your privacy

"Great service. Will use again for certain "

Mike L on September 2025

We at MSP HEATING AND AIR focus on quality HVAC services over quantity. We use our years of experience and expertise, to complete your project with perfection. Customer service and honesty are the most important aspects of our business and your satisfaction is guaranteed! Please call us today for an estimate. We look forward to working with you! we keep your privacy

"Great service. Will use again for certain "

Mike L on September 2025

Avatar for AC Heat Diamond Bar

AC Heat Diamond Bar

4.52(
62
)
•Approved Pro

AC Heat Diamond Bar

4.52(
62
)
•Approved Pro
Customers say: Quick response
Recommended by 96% of Angi customers
Recommended by 96% of HomeAdvisor customers
1 years of experience

AC Heat Diamond Bar is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests and make their concerns the basis of our business.

"Fair and honest work."

Maria S on June 2023

AC Heat Diamond Bar is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests and make their concerns the basis of our business.

"Fair and honest work."

Maria S on June 2023

Avatar for Power Pro Plumbing, Inc.

Power Pro Plumbing, Inc.

4.56(
302
)
•Approved Pro

Power Pro Plumbing, Inc.

4.56(
302
)
•Approved Pro
Customers say: Quality work
Recommended by 91% of Angi customers
Recommended by 91% of HomeAdvisor customers
16 local quotes requested

Experience our Powerful, Professional, & Affordable services. Call Power Pro Plumbing Heating & Air for plumbing, heating, or AC needs. Call: 833-457-8415.

"Outstanding"

Lee M on August 2022

Experience our Powerful, Professional, & Affordable services. Call Power Pro Plumbing Heating & Air for plumbing, heating, or AC needs. Call: 833-457-8415.

"Outstanding"

Lee M on August 2022

Avatar for Trinity Heating and AC

Trinity Heating and AC

5.00(
34
)
•Approved Pro

Trinity Heating and AC

5.00(
34
)
•Approved Pro
Super Service Award
Customers say: Quick response
60 local quotes requested
5 years of experience

Trinity Heating and AC is so much more than another heating/AC company. We exceed our customer’s expectations and standards in a number of ways; such as arriving within the promised time frame or leave our work space cleaner then we found it! We provide custom solutions that take all factors into consideration so we can design a system that will meet the needs of your home and everyone in it! We offer so much more then just replacement of your existing system or installation of a new one. Do you have high utility bills when you are running the system, or someone’s allergies are aggravated when running the system? No matter what your need, if it has anything to do with HEATING, COOLING, AIR FLOW, or AIR QUALITY; TRINITY HEATING AND AC is ready to help!

"Experienced, Professional, made sure it was working before he left. Knowledgeable about smart thermostats. Friendly and easy to talk to and provided much needed guidance "

amdrew d on January 2026

Trinity Heating and AC is so much more than another heating/AC company. We exceed our customer’s expectations and standards in a number of ways; such as arriving within the promised time frame or leave our work space cleaner then we found it! We provide custom solutions that take all factors into consideration so we can design a system that will meet the needs of your home and everyone in it! We offer so much more then just replacement of your existing system or installation of a new one. Do you have high utility bills when you are running the system, or someone’s allergies are aggravated when running the system? No matter what your need, if it has anything to do with HEATING, COOLING, AIR FLOW, or AIR QUALITY; TRINITY HEATING AND AC is ready to help!

"Experienced, Professional, made sure it was working before he left. Knowledgeable about smart thermostats. Friendly and easy to talk to and provided much needed guidance "

amdrew d on January 2026

Avatar for SOCAL AIR QUALITY HEATING AND AIR

SOCAL AIR QUALITY HEATING AND AIR

5.00(
18
)
•Approved Pro

SOCAL AIR QUALITY HEATING AND AIR

5.00(
18
)
•Approved Pro
Customers say: Quick response
Recommended by 94% of Angi customers
Recommended by 94% of HomeAdvisor customers
2 years of experience

SOCAL AIR QUALITY HEATING AND AIR is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers interests, and make their concerns the basis of our business.

"Pedro was cordial and professional and gave me options on replacement thermostats that was easy for me to operate."

Larice S on December 2025

SOCAL AIR QUALITY HEATING AND AIR is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers interests, and make their concerns the basis of our business.

"Pedro was cordial and professional and gave me options on replacement thermostats that was easy for me to operate."

Larice S on December 2025

Avatar for Garcia's Home Repair

Garcia's Home Repair

5.00(
13
)
•Approved Pro

Garcia's Home Repair

5.00(
13
)
•Approved Pro
Customers say: Quick response
Recommended by 92% of Angi customers
Recommended by 92% of HomeAdvisor customers
91 local quotes requested

Garcia's Home Repair, your trusted partner for all your handyman needs in Los Angeles. Our skilled team delivers exceptional craftsmanship and attention to detail, ensuring your home projects are completed to perfection. Contact us today for a flawless finish that sets your home apart.

"Super happy with service from both Angi’s list and the handyman. He was professional, did a great job installing a dog door and was tidy cleaning up after. Recommend and will use again in the future"

Michele L on November 2025

Garcia's Home Repair, your trusted partner for all your handyman needs in Los Angeles. Our skilled team delivers exceptional craftsmanship and attention to detail, ensuring your home projects are completed to perfection. Contact us today for a flawless finish that sets your home apart.

"Super happy with service from both Angi’s list and the handyman. He was professional, did a great job installing a dog door and was tidy cleaning up after. Recommend and will use again in the future"

Michele L on November 2025

Avatar for Drain Right Services, Inc.

Drain Right Services, Inc.

4.38(
50
)
•Approved Pro

Drain Right Services, Inc.

4.38(
50
)
•Approved Pro
Customers say: Quick response
18 local quotes requested
22 years of experience

We are a full service plumbing company offering residential plumbing services in LA and Orange County. Our expert technicians offer a wide range of services for new installations and complete plumbing repair. Our services include drain cleaning, sewer repair, trenchless sewer, hot water heaters, gas lines, and water filtration systems. We guarantee fast, reliable, affordable plumbing services with up front flat rate pricing, so there are no surprises. Please browse our website to learn more about our company and our plumbing, drain cleaning, sewer repair, and other services. Give Drain Right Services a call today at (800) 208-8875 for more information or to request service at your home in LA or Orange County.

"Terrible people. DO NOT USE. I had my water main line burst at my house and the folks at drain right where in the neighborhood, identified a problem, and knocked on my door. My pregnant wife was home at the time of pipe bust, but was initially unaware of the issue as water was still making it to our home. At first we thought this was a godsend, nice workers who identified an issue wanted to help, how lucky are we. They kindly shut off the water to the house and asked my pregnant wife, who was freaking out by the amount of water shooting out from burst pipe, to sign an authorization form to do work. She was so grateful someone was there to help she happily signed the slip. I was grateful someone was able to help my wife while I was at work. The problem started when I noted what she had signed.. They charged me $341 for a visual inspection. They identified the problem as a tree root that struck a pipe (which was not what in fact happened) and wrote 2 appraisals for solving the issue. The fist solution was replacing the galvanized pipe with another galvanized pipe for $7500. The second was to re reroute the sewer line to our house with copper piping, estimated at a whopping $11,300. I tried to call manager the evening of the pipe bust schedule an appointment as the water was shut off to my house. No response. In fact it took the manager a week to return my phone call to schedule the job, which I had bid out and already resolved. I was recommended a plumber to get a second opinion, and he came promptly and re-routed the sewer line with coper piping for less than half what Drain Right was asking for the job. I have been trying to dispute this invoice with Drain Right for months because its my belief they initially took advantage of my pregnant wife and there terrible service, and instead of returning my phone calls they sent my bill to a debt collection service. What horrible service by a terrible business."

David s on January 2023

We are a full service plumbing company offering residential plumbing services in LA and Orange County. Our expert technicians offer a wide range of services for new installations and complete plumbing repair. Our services include drain cleaning, sewer repair, trenchless sewer, hot water heaters, gas lines, and water filtration systems. We guarantee fast, reliable, affordable plumbing services with up front flat rate pricing, so there are no surprises. Please browse our website to learn more about our company and our plumbing, drain cleaning, sewer repair, and other services. Give Drain Right Services a call today at (800) 208-8875 for more information or to request service at your home in LA or Orange County.

"Terrible people. DO NOT USE. I had my water main line burst at my house and the folks at drain right where in the neighborhood, identified a problem, and knocked on my door. My pregnant wife was home at the time of pipe bust, but was initially unaware of the issue as water was still making it to our home. At first we thought this was a godsend, nice workers who identified an issue wanted to help, how lucky are we. They kindly shut off the water to the house and asked my pregnant wife, who was freaking out by the amount of water shooting out from burst pipe, to sign an authorization form to do work. She was so grateful someone was there to help she happily signed the slip. I was grateful someone was able to help my wife while I was at work. The problem started when I noted what she had signed.. They charged me $341 for a visual inspection. They identified the problem as a tree root that struck a pipe (which was not what in fact happened) and wrote 2 appraisals for solving the issue. The fist solution was replacing the galvanized pipe with another galvanized pipe for $7500. The second was to re reroute the sewer line to our house with copper piping, estimated at a whopping $11,300. I tried to call manager the evening of the pipe bust schedule an appointment as the water was shut off to my house. No response. In fact it took the manager a week to return my phone call to schedule the job, which I had bid out and already resolved. I was recommended a plumber to get a second opinion, and he came promptly and re-routed the sewer line with coper piping for less than half what Drain Right was asking for the job. I have been trying to dispute this invoice with Drain Right for months because its my belief they initially took advantage of my pregnant wife and there terrible service, and instead of returning my phone calls they sent my bill to a debt collection service. What horrible service by a terrible business."

David s on January 2023

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FAQs for thermostat installation and replacement projects in Fullerton, 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 Fullerton, 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.

See all articles