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Thermostat installers and replacers in Gainesville

Avatar for Brooks Heating & Air, LLC
Brooks Heating & Air, LLC
9007 Center Street
4.65(
129
)
•
Approved Pro
Brooks Heating & Air, LLC
9007 Center Street
4.65(
129
)
•
Approved Pro
Customers say: Quick response
13 years of experience
Free onsite estimate

Brooks Heating & Air is dedicated to providing the best cooling, heating and air solutions for your home or business. If you need air conditioning or heating services from a well-established HVAC company in Northern VA, call Brooks Heating & Air for reliable heating and cooling services.

"satisfied"

Subbarao K on February 2023

Brooks Heating & Air is dedicated to providing the best cooling, heating and air solutions for your home or business. If you need air conditioning or heating services from a well-established HVAC company in Northern VA, call Brooks Heating & Air for reliable heating and cooling services.

"satisfied"

Subbarao K on February 2023


Avatar for Appleton Campbell, Inc.
Appleton Campbell, Inc.
285 Alwington Blvd
4.70(
46
)
•
Approved Pro
Appleton Campbell, Inc.
285 Alwington Blvd
4.70(
46
)
•
Approved Pro
Super Service Award
Customers say: Quick response
Recommended by 93% of Angi customers
Recommended by 93% of HomeAdvisor customers
133 local quotes requested

Appleton Campbell is the local name you can count on for all of your plumbing, heating, cooling and electrical needs.

"Yes the job was completed and worked. The plumber that they sent out was not professional."

Gail D on February 2025

Appleton Campbell is the local name you can count on for all of your plumbing, heating, cooling and electrical needs.

"Yes the job was completed and worked. The plumber that they sent out was not professional."

Gail D on February 2025


Avatar for Elements Of Energy L.L.C.
Elements Of Energy L.L.C.
8913 Canberra Dr
5.00(
11
)
•
Approved Pro
Elements Of Energy L.L.C.
8913 Canberra Dr
5.00(
11
)
•
Approved Pro
Super Service Award
Customers say: Quick response
26 local quotes requested
3 years of experience

We provide services to homeowners and businesses throughout Northern Virginia, Washington D.C. and Maryland. We spend time during each call asking questions to fully assess the situation, and are usually able to determine the best course of action before we send a truck out to your home or business. We’ve been in the business of employing the most knowledgeable, professional, attentive, and courteous electricians in all of “DMV”. It’s our attention to service and quality, Each appointment made with one of our clients is set up by one of our experienced electricians.

"Kevin did very excellent and thorough installation of the EV charging outlet."

Yuhong W on March 2025

We provide services to homeowners and businesses throughout Northern Virginia, Washington D.C. and Maryland. We spend time during each call asking questions to fully assess the situation, and are usually able to determine the best course of action before we send a truck out to your home or business. We’ve been in the business of employing the most knowledgeable, professional, attentive, and courteous electricians in all of “DMV”. It’s our attention to service and quality, Each appointment made with one of our clients is set up by one of our experienced electricians.

"Kevin did very excellent and thorough installation of the EV charging outlet."

Yuhong W on March 2025


Avatar for SwiftPro
SwiftPro
11350 Random Hills Rd, Suite 886
5.00(
9
)
•
Approved Pro
SwiftPro
11350 Random Hills Rd, Suite 886
5.00(
9
)
•
Approved Pro
Customers say: Quick response
1 years of experience
Free onsite estimate

When your business or home comfort system breaks down, you need a solution—fast. At SwiftPro, we help homeowners in Fairfax, VA and across Northern Virginia get back to comfort with reliable, professional service they can trust. As a local, family-owned business, we take pride in doing the job right—with clear communication, upfront pricing, and respect for your time and your home. Whether it's a quick AC repair, a new air conditioning installation, or help with water heaters, heating systems, or full HVAC replacements, we're here to guide you every step of the way. Our expert technicians deliver solutions that are fast, fair, and built to last—because your comfort and peace of mind matter. 📍 Serving Fairfax, Chantilly, Centreville, Herndon, Vienna, Burke, and surrounding Northern Virginia communities. 📅 Schedule your service today and experience the SwiftPro difference—where family values meet five-star service.

"Competent and efficient technician. Owner made sure everything was done properly "

Daniel D on January 2025

When your business or home comfort system breaks down, you need a solution—fast. At SwiftPro, we help homeowners in Fairfax, VA and across Northern Virginia get back to comfort with reliable, professional service they can trust. As a local, family-owned business, we take pride in doing the job right—with clear communication, upfront pricing, and respect for your time and your home. Whether it's a quick AC repair, a new air conditioning installation, or help with water heaters, heating systems, or full HVAC replacements, we're here to guide you every step of the way. Our expert technicians deliver solutions that are fast, fair, and built to last—because your comfort and peace of mind matter. 📍 Serving Fairfax, Chantilly, Centreville, Herndon, Vienna, Burke, and surrounding Northern Virginia communities. 📅 Schedule your service today and experience the SwiftPro difference—where family values meet five-star service.

"Competent and efficient technician. Owner made sure everything was done properly "

Daniel D on January 2025


Avatar for JW Home Improvement
JW Home Improvement
849 Quince Orchard Blvd
4.39(
5,499
)
•
Approved Pro
JW Home Improvement
849 Quince Orchard Blvd
4.39(
5,499
)
•
Approved Pro
Customers say: Quality work
7046 local quotes requested
24 years of experience

JWHI provides world-class customer service with consistent and superior workmanship. We strive to be the trusted market leader in the home improvement industry. Proudly, we are Super Service Award Winner for over a decade, and we plan to keep that streak going! Contact us today to discuss your next handyman or remodeling project. Our mission is to provide you with a happy home improvement experience!

"Fine it was fine"

Jonathan S on April 2025

JWHI provides world-class customer service with consistent and superior workmanship. We strive to be the trusted market leader in the home improvement industry. Proudly, we are Super Service Award Winner for over a decade, and we plan to keep that streak going! Contact us today to discuss your next handyman or remodeling project. Our mission is to provide you with a happy home improvement experience!

"Fine it was fine"

Jonathan S on April 2025


Avatar for Relax HVAC, Inc.
Relax HVAC, Inc.
43330 Junction Plz
5.00(
28
)
•
Approved Pro
Relax HVAC, Inc.
43330 Junction Plz
5.00(
28
)
•
Approved Pro
Customers say: Quality work
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
777 local quotes requested

Relax HVAC, Inc. is a fully insured and licensed heating and air conditioning firm in Ashburn, Virginia, composed of Master Technicians led by Kamal. He and his team provide round-the-clock emergency services for residential and commercial customers, including those in the Iranian, Arabic, and Palestinian communities. With more than 25 years of experience in providing air conditioning services, Kamal takes pride in making customers feel good about his company. He does this by giving them quality and honest services at great prices. His services are approved and recommended by the Loudoun County Fire Department.

"My AC failed and I had limited time to find a good solution, I made a phone call to Relax HVAC based on the online reviews and it was a great decision. Nasser came to check the situation, he gave a very detailed and comprehensive overview of the situation and provided with the options I had. I decided to replace the unit, Nasser went above and beyond to find a unit delivery service but there was nothing available over the weekend so this gentleman went for unit pick up himself and finished the installation within a day from my initial call. Moreover, the provided price was very reasonable.I can't be more happy with the outcome and highly recommend Relax HVAC"

Navid P on July 2024

Relax HVAC, Inc. is a fully insured and licensed heating and air conditioning firm in Ashburn, Virginia, composed of Master Technicians led by Kamal. He and his team provide round-the-clock emergency services for residential and commercial customers, including those in the Iranian, Arabic, and Palestinian communities. With more than 25 years of experience in providing air conditioning services, Kamal takes pride in making customers feel good about his company. He does this by giving them quality and honest services at great prices. His services are approved and recommended by the Loudoun County Fire Department.

"My AC failed and I had limited time to find a good solution, I made a phone call to Relax HVAC based on the online reviews and it was a great decision. Nasser came to check the situation, he gave a very detailed and comprehensive overview of the situation and provided with the options I had. I decided to replace the unit, Nasser went above and beyond to find a unit delivery service but there was nothing available over the weekend so this gentleman went for unit pick up himself and finished the installation within a day from my initial call. Moreover, the provided price was very reasonable.I can't be more happy with the outcome and highly recommend Relax HVAC"

Navid P on July 2024


Avatar for The Doctor House, LLC
The Doctor House, LLC
9290 Towerside Dr
4.56(
126
)
•
Approved Pro
The Doctor House, LLC
9290 Towerside Dr
4.56(
126
)
•
Approved Pro
Customers say: Quality work
850 local quotes requested
19 years of experience

The Doctor House, Handyman, we can do almost everything, using good materials, no job is to small if we can't do we have a business partners and we can help you with your Home Improvement or your HONEY DO LIST, also we am do interior and exterior painting, drywall repair and hanging, finishing, roof repair, light electric, and light pluming, deck repair, kitchen, basements, laundry rooms, and much more.

"Carlos was very friendly and knowledgeable. I will use him for a future project."

Liam T on April 2025

The Doctor House, Handyman, we can do almost everything, using good materials, no job is to small if we can't do we have a business partners and we can help you with your Home Improvement or your HONEY DO LIST, also we am do interior and exterior painting, drywall repair and hanging, finishing, roof repair, light electric, and light pluming, deck repair, kitchen, basements, laundry rooms, and much more.

"Carlos was very friendly and knowledgeable. I will use him for a future project."

Liam T on April 2025


Avatar for Zee Servicing LLC
Zee Servicing LLC
New on HomeAdvisorNew on Angi•
Approved Pro
Zee Servicing LLC
New on AngiNew on HomeAdvisor•
Approved Pro
9 years of experience
Free onsite estimate

We are specialized in all type of maintenance, repairs, and remodeling, plumbing, drywall, painting and carpentry projects in DMV area. Our expert handyman are always ready around the clock to handle all of your needs on timely and professional manner. Zee Servicing LLC also do basement framing, kitchen and bathroom remodeling too.

We are specialized in all type of maintenance, repairs, and remodeling, plumbing, drywall, painting and carpentry projects in DMV area. Our expert handyman are always ready around the clock to handle all of your needs on timely and professional manner. Zee Servicing LLC also do basement framing, kitchen and bathroom remodeling too.


Avatar for Modern Mechanical
Modern Mechanical
21730 Red Rum Dr
4.33(
43
)
•
Approved Pro
Modern Mechanical
21730 Red Rum Dr
4.33(
43
)
•
Approved Pro
Customers say: Super punctual
848 local quotes requested
16 years of experience

Modern Mechanical is your trusted partner for all your heating and A/C needs in Washington D.C. With our Virginia Class A License 2705 134143A, we are committed to providing top-notch service and expertise. Contact us today for all your home comfort needs.

"I have been a customer for a very long time and this scheduled maintenance and dryer vent cleaning was done by Cesar. I have to say he is one very thorough technician and I was very pleased with his inspection and vent cleaning. His service was so different than some of the ones I've had before. I even had one inspector tell me he didn't need to check in my attic which houses one of our two units. Let me tell you about Cesar, he even cleaned up behind my dryer for me. This is something that is rare in customer service. I have my HVAC seasonally maintenanced and never had a inspector be as thorough as him. The pictures he took and explained to me and the one problem he found that no other inspector had found in all this time. I tried to spare him from the attic heat for the repair and have him return on another day in the morning but he didn't mind going back in there to fix the problem for us although it was in the dead heat of the day. I just hope the company sees this review and knows what a good technician they have in Cesar."

Deborah M on August 2023

Modern Mechanical is your trusted partner for all your heating and A/C needs in Washington D.C. With our Virginia Class A License 2705 134143A, we are committed to providing top-notch service and expertise. Contact us today for all your home comfort needs.

"I have been a customer for a very long time and this scheduled maintenance and dryer vent cleaning was done by Cesar. I have to say he is one very thorough technician and I was very pleased with his inspection and vent cleaning. His service was so different than some of the ones I've had before. I even had one inspector tell me he didn't need to check in my attic which houses one of our two units. Let me tell you about Cesar, he even cleaned up behind my dryer for me. This is something that is rare in customer service. I have my HVAC seasonally maintenanced and never had a inspector be as thorough as him. The pictures he took and explained to me and the one problem he found that no other inspector had found in all this time. I tried to spare him from the attic heat for the repair and have him return on another day in the morning but he didn't mind going back in there to fix the problem for us although it was in the dead heat of the day. I just hope the company sees this review and knows what a good technician they have in Cesar."

Deborah M on August 2023


Avatar for Appleton Campbell
Appleton Campbell
285 Alwington Blvd
4.64(
320
)
•
Approved Pro
Appleton Campbell
285 Alwington Blvd
4.64(
320
)
•
Approved Pro
Customers say: Quick response
Recommended by 90% of Angi customers
Recommended by 90% of HomeAdvisor customers
1117 local quotes requested

Call today for FREE Estimates for new heating and cooling systems, water heaters, water filtration and electrical panels and whole home generators. Founded in 1976 by Jim Appleton, grandfather of current President Mike Appleton—Appleton Campbell has remained a locally owned and operated business dedicated to their customers, employees and communities. Honesty, integrity, and experience are the cornerstones on which Appleton Campbell was built and on which it continues to grow today. Committed to outstanding customer service Appleton Campbell provides: - Highly trained technicians who treat you and your home with courtesy and respect - Flat-rate pricing—the price you are quoted up front is the price you will pay—there are no surprises - Guaranteed service and customer satisfaction

"Being a MVP customer was time for Heating/Cooling safety inspections. Kevin Stanley was the HVAC Service Tech assigned to the job. He went over a few issues on our older unit he found during his inspection. I never felt pressured to have the work done and so glad he resolved them on the same day. He definitely went out of his way doing a great job. He explained everything to me that he was doing and also answering all the questions I had. The price was reasonable. Will definitely call Appleton Campbell when needing home repairs, this is our 3rd project they’ve taken care of. Thanks again"

cindy s on May 2025

Call today for FREE Estimates for new heating and cooling systems, water heaters, water filtration and electrical panels and whole home generators. Founded in 1976 by Jim Appleton, grandfather of current President Mike Appleton—Appleton Campbell has remained a locally owned and operated business dedicated to their customers, employees and communities. Honesty, integrity, and experience are the cornerstones on which Appleton Campbell was built and on which it continues to grow today. Committed to outstanding customer service Appleton Campbell provides: - Highly trained technicians who treat you and your home with courtesy and respect - Flat-rate pricing—the price you are quoted up front is the price you will pay—there are no surprises - Guaranteed service and customer satisfaction

"Being a MVP customer was time for Heating/Cooling safety inspections. Kevin Stanley was the HVAC Service Tech assigned to the job. He went over a few issues on our older unit he found during his inspection. I never felt pressured to have the work done and so glad he resolved them on the same day. He definitely went out of his way doing a great job. He explained everything to me that he was doing and also answering all the questions I had. The price was reasonable. Will definitely call Appleton Campbell when needing home repairs, this is our 3rd project they’ve taken care of. Thanks again"

cindy s on May 2025

...
Showing 1-10 of 901

Thermostat installations and replacements FAQs

It's often worth replacing your old thermostat with a newer model that can enhance your home's comfort and energy efficiency. Upgrading to a programmable or smart thermostat can save you up to $200 per year on energy bills. Plus, smart thermostats offer convenient features like remote control and learning capabilities, making your home more comfortable and easier to manage.

Signs of a bad thermostat include your HVAC system not turning on when it's supposed to or failing to reach the desired temperature. If the thermostat's display is blank or not functioning properly, it could be malfunctioning. Another indicator is the HVAC system running continuously without shutting off or cycling on and off too frequently. You might also notice uneven temperatures throughout your home, with some rooms being too warm or too cold. These issues suggest that the thermostat is failing and may need repair or replacement to ensure your HVAC system operates efficiently.

A thermostat should last between 10 to 20 years, depending on its quality and how well it's maintained. Over time, dust, wiring issues, and general wear can affect its performance. Even if a thermostat is still functioning after 10 years, you might choose to replace it to take advantage of newer energy-saving technologies and smart home integrations. Upgrading to a modern thermostat can improve efficiency, offer more control over your home's climate, and potentially lower energy bills.

The number of thermostats you need depends on your home's size, layout, and heating and cooling zones. In a standard single-zone HVAC system, one thermostat controls the temperature for the entire home. However, larger homes or those with multiple floors might benefit from multiple thermostats linked to a multi-zone HVAC system. This setup can offer better comfort and energy efficiency: It lets you customize the temperature in different areas, so you're only heating or cooling the spaces you're using.

Replacing a thermostat typically takes a professional technician about one to two hours to complete. If you're swapping out an existing thermostat for a similar model with compatible wiring, the process can be done in less than an hour. However, installing a new thermostat that requires additional wiring, such as a smart thermostat, or moving the thermostat to a new location can extend the time to two hours or more. Complex installations may also involve cutting into drywall or integrating with other home systems, which can add to the duration.

There are a few things that can cause your home thermostat to fail. The most simple one is age and cleanliness. Dirt, grease, dust, and other small particles can clog sensors and cause malfunctions in readings. You may also have a failing power supply and loose connections, and the simplest cause is that it isn't installed in the right place in your home so it can't properly sense air temperature. Repairing a thermostat costs around $210.

The homeowners guide to thermostat installations and replacements
From average costs to expert advice, get all the answers you need to get your job done.
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