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Find Thermostat installers and replacers in Placentia

Avatar for EM Heating And Air Conditioning

EM Heating And Air Conditioning

316 E PEACE ST
5.00(
4
)
Approved Pro

EM Heating And Air Conditioning

316 E PEACE ST
5.00(
4
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
8 years of experience

EM Heating and Air specializes in reliable HVAC services across Long Beach to Orange County. Whether you need installation, repair, or maintenance, our experienced technicians ensure your home stays comfortable year-round. We pride ourselves on quick response times, quality workmanship, and excellent customer service. No job is too big or too small—trust us to handle all your heating and cooling needs!

"I had a fantastic experience with EM Heating and Air when they installed a new central AC system in my home. The entire process was smooth and professional from start to finish. The team arrived on time, worked efficiently, and their attention to detail was impressive. They explained the installation process clearly and made sure everything was set up perfectly. My new AC system works like a dream, and I couldnâ  t be happier with the results. I highly recommend EM Heating and Air for anyone looking for top-notch HVAC services!"

Louis M on October 2024

EM Heating and Air specializes in reliable HVAC services across Long Beach to Orange County. Whether you need installation, repair, or maintenance, our experienced technicians ensure your home stays comfortable year-round. We pride ourselves on quick response times, quality workmanship, and excellent customer service. No job is too big or too small—trust us to handle all your heating and cooling needs!

"I had a fantastic experience with EM Heating and Air when they installed a new central AC system in my home. The entire process was smooth and professional from start to finish. The team arrived on time, worked efficiently, and their attention to detail was impressive. They explained the installation process clearly and made sure everything was set up perfectly. My new AC system works like a dream, and I couldnâ  t be happier with the results. I highly recommend EM Heating and Air for anyone looking for top-notch HVAC services!"

Louis M on October 2024


Avatar for Four Seasons Heating and Air LLC

Four Seasons Heating and Air LLC

3111 East La Palma Ave
New on HomeAdvisorNew on HomeAdvisor
Approved Pro

Four Seasons Heating and Air LLC

3111 East La Palma Ave
New on HomeAdvisorNew on HomeAdvisor
Approved Pro
25 local quotes requested
2 years of experience

We are 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.

We are 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.


Avatar for MSP Heating and Air, LLC

MSP Heating and Air, LLC

2932 Rubidoux Blvd, Ste B
4.93(
286
)
Approved Pro

MSP Heating and Air, LLC

2932 Rubidoux Blvd, Ste B
4.93(
286
)
Approved Pro
Customers say: True professional
Recommended by 95% of Angi customers
Recommended by 95% of HomeAdvisor customers
378 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 Canyon City Air

Canyon City Air

615 Los Cerritos Rd
5.00(
12
)
Approved Pro

Canyon City Air

615 Los Cerritos Rd
5.00(
12
)
Approved Pro
Customers say: Quick response
65 local quotes requested
2 years of experience

Canyon City 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.

"Great customer service. Very professional."

Ken N on September 2025

Canyon City 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.

"Great customer service. Very professional."

Ken N on September 2025


Avatar for True Home Heating and Air Conditioning

True Home Heating and Air Conditioning

4 Faraday
4.93(
30
)
Approved Pro

True Home Heating and Air Conditioning

4 Faraday
4.93(
30
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
12 local quotes requested

True Home Heating and Air Conditioning 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 customer's interests and make their concerns the basis of our business. Please give us a call today!

"Very prompt service to a very urgent need. The professional that responded to our office was outstanding in every way."

VICTOR L on November 2023

True Home Heating and Air Conditioning 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 customer's interests and make their concerns the basis of our business. Please give us a call today!

"Very prompt service to a very urgent need. The professional that responded to our office was outstanding in every way."

VICTOR L on November 2023


Avatar for SO CAL BOYS HEATING & AIR INC

SO CAL BOYS HEATING & AIR INC

13397 Harlow Ave
4.96(
47
)
Approved Pro

SO CAL BOYS HEATING & AIR INC

13397 Harlow Ave
4.96(
47
)
Approved Pro
Customers say: True professional
84 local quotes requested
3 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!

"fantastic job. Professional. Provided advise on what needs be done in the future."

Sean O on October 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!

"fantastic job. Professional. Provided advise on what needs be done in the future."

Sean O on October 2025


Avatar for Sean Patrick HVAC, Inc.

Sean Patrick HVAC, Inc.

13236 Flagstaff Drive
5.00(
8
)
Approved Pro

Sean Patrick HVAC, Inc.

13236 Flagstaff Drive
5.00(
8
)
Approved Pro
Customers say: Quick response
124 local quotes requested
5 years of experience

Welcome to Sean Patrick HVAC, Your Trusted HVAC Contractor Serving SOCAL, CA and Surrounding Areas. For over 10 years, we’ve provided exceptional HVAC repairs, HVAC replacement, air conditioning maintenance, furnace replacement, and indoor air quality services for residential and commercial customers. Our NATE-certified technicians have the experience and expertise to correctly diagnose and repair all makes and models of HVAC systems. We offer 24/7 emergency HVAC repair service, so you’re never left in the cold or heat. As your local HVAC contractor, we provide: HVAC Repairs – Get your AC, furnace, or heat pump running again quickly with our skilled repair technicians HVAC Replacement – We replace old, inefficient HVAC systems with new top brand models properly sized for your home/business Air Conditioning Maintenance – Preventative maintenance maximizes the lifespan of your AC system Furnace Replacement – We replace broken furnaces with energy efficient new models

"spoke to Laura on a monday had my AC installed on thursday the technicians were on time and very professional.Sean answered all my questions and gave me a estimate right away.its good to know there are still contractors that take pride in there work I highly recomend SPH. "

David O on May 2025

Welcome to Sean Patrick HVAC, Your Trusted HVAC Contractor Serving SOCAL, CA and Surrounding Areas. For over 10 years, we’ve provided exceptional HVAC repairs, HVAC replacement, air conditioning maintenance, furnace replacement, and indoor air quality services for residential and commercial customers. Our NATE-certified technicians have the experience and expertise to correctly diagnose and repair all makes and models of HVAC systems. We offer 24/7 emergency HVAC repair service, so you’re never left in the cold or heat. As your local HVAC contractor, we provide: HVAC Repairs – Get your AC, furnace, or heat pump running again quickly with our skilled repair technicians HVAC Replacement – We replace old, inefficient HVAC systems with new top brand models properly sized for your home/business Air Conditioning Maintenance – Preventative maintenance maximizes the lifespan of your AC system Furnace Replacement – We replace broken furnaces with energy efficient new models

"spoke to Laura on a monday had my AC installed on thursday the technicians were on time and very professional.Sean answered all my questions and gave me a estimate right away.its good to know there are still contractors that take pride in there work I highly recomend SPH. "

David O on May 2025


Avatar for Marco Montes

Marco Montes

334 S. Westlake
4.86(
70
)
Approved Pro

Marco Montes

334 S. Westlake
4.86(
70
)
Approved Pro
Customers say: Quick response
Recommended by 94% of Angi customers
Recommended by 94% of HomeAdvisor customers
269 local quotes requested

2 employees. Occasionally uses subs for hardwood floors. Cost is determined by the job. No travel charges. No service charges. No extra charge for after hours service.

"Great. Professional and prepared."

Michael S on September 2025

2 employees. Occasionally uses subs for hardwood floors. Cost is determined by the job. No travel charges. No service charges. No extra charge for after hours service.

"Great. Professional and prepared."

Michael S on September 2025


Avatar for Harmony Electrical, Plumbing and Air

Harmony Electrical, Plumbing and Air

11121 First Ave
5.00(
12
)
Approved Pro

Harmony Electrical, Plumbing and Air

11121 First Ave
5.00(
12
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
3917 local quotes requested

Harmony Electrical, Plumbing and Air is dedicated to delivering exceptional electrical, plumbing and Air services tailored to meet the unique needs of each client. Our mission is to ensure reliability and quality through customized solutions, supported by a team of highly skilled and experienced technicians who are always prepared to provide outstanding service. We are committed to your satisfaction and will not consider the job complete until it meets our high standards. Our pride lies in the quality of our work and our commitment to excellent customer service. Explore the range of services we offer below, and feel free to call or click to schedule your free estimate today!

"Tyler was excellent and Brian was very accommodating for my schedule. I would definitely use them in the future."

Pixie B on September 2025

Harmony Electrical, Plumbing and Air is dedicated to delivering exceptional electrical, plumbing and Air services tailored to meet the unique needs of each client. Our mission is to ensure reliability and quality through customized solutions, supported by a team of highly skilled and experienced technicians who are always prepared to provide outstanding service. We are committed to your satisfaction and will not consider the job complete until it meets our high standards. Our pride lies in the quality of our work and our commitment to excellent customer service. Explore the range of services we offer below, and feel free to call or click to schedule your free estimate today!

"Tyler was excellent and Brian was very accommodating for my schedule. I would definitely use them in the future."

Pixie B on September 2025


Avatar for On Time Home Services

On Time Home Services

43397 Business Park Dr
4.94(
18
)
Approved Pro

On Time Home Services

43397 Business Park Dr
4.94(
18
)
Approved Pro
Customers say: True professional
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
390 local quotes requested

On Time Home Services is an HVAC company that has been putting our customers first since opening in 2005. We offer expert heating, cooling, and indoor air quality services to homes throughout Temecula and surrounding areas. To make your repair, replacement, installation, or maintenance service as convenient as possible we provide flexible scheduling, same-day appointments, and emergency after-hours and weekend repairs. With free, in-person estimates, friendly and honest customer service, and workmanship that is second to none, you can trust On Time Home Services to be your partner in comfort. Our licensed and insured technicians will go above and beyond to ensure our customers’ complete satisfaction.

"Fantastic service. Ryan and Carlos were very knowledgeable and courteous. Even had same day service. Would recommend to all family and friends! Called on when to expect them so I wasn’t waiting around."

Debbie S on April 2024

On Time Home Services is an HVAC company that has been putting our customers first since opening in 2005. We offer expert heating, cooling, and indoor air quality services to homes throughout Temecula and surrounding areas. To make your repair, replacement, installation, or maintenance service as convenient as possible we provide flexible scheduling, same-day appointments, and emergency after-hours and weekend repairs. With free, in-person estimates, friendly and honest customer service, and workmanship that is second to none, you can trust On Time Home Services to be your partner in comfort. Our licensed and insured technicians will go above and beyond to ensure our customers’ complete satisfaction.

"Fantastic service. Ryan and Carlos were very knowledgeable and courteous. Even had same day service. Would recommend to all family and friends! Called on when to expect them so I wasn’t waiting around."

Debbie S on April 2024

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

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