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Top-Rated Geothermal heating or cooling system installers in Ontario - Updated Nov 2026

Avatar for HD MECHANICAL INC
HD MECHANICAL INC
4.9(
32
)
Geothermal Heating or Cooling System - Install

Serving Ontario, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2022

Free estimates

Emergency services offered

"From start to finish, my experience with HD Mechanical Inc. was exceptional. They expertly installed our outdoor patio heaters and ac unit for my home, ensuring seamless communication every step of the way. Their professionalism was evident throughout the process, and they went above and beyond to meet our specific preferences and built everything to code. Now, thanks to their diligent work, our heaters function flawlessly, delivering the perfect ambiance to our outdoor space. I couldn't be happier with the outcome and highly recommend HD Mechanical Inc. for any heating or cooling needs."
Heating & A/C Project
Heating & A/C Project
Heating & A/C Project
Heating & A/C Project
Additional Photos

+14

Response time6 hrs
Response rate100%
62 neighbors recently requested a quote
Avatar for Alpine Plumbing, Heating, and Air
Alpine Plumbing, Heating, and Air
4.7(
36
)
Geothermal Heating or Cooling System - Install

Serving Ontario, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2014

Free estimates

Emergency services offered

"He was thorough, knowledgeful, listened to my concerns, respectful and got the job done quickly and efficiently with my plumbing problem. I would recommend Alpine Heating, plumbing and electrical services to anyone...and do recommend them."
Plumbing - Drain Cleaning Project
Sewer cleaned of roots and ready for lining
Prepping pipe for lining by removing massive roots
Mixing resin for liners, this resin gardens to create a solid pipe
Sewer robot in the pipe

+26

Response time9 hrs
10 neighbors recently requested a quote
Recommended by67%of homeowners
Avatar for R&A PLUMBING & HVAC
R&A PLUMBING & HVAC
5.0(
9
)
Geothermal Heating or Cooling System - Install

Serving Ontario, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2024

Free estimates

Emergency services offered

R & A Plumbing & HVAC was founded in 2024 and designed to help out the community in providing proper plumbing and clean air sanitation. We understand having plumbing or AC issues can be quiet the experience especially if you hire the wrong contractor. Our sole purpose is to help out those who are in looking for quality and fair priced plumbing and AC contractor to be done in your home. We take great precaution when working in or around your home and get into detail about your issue so you are aware of how to prevent further or reoccurring issues. Feel free to give a call to (951)-992-6216 for any questions or to schedule an appointment. All estimates over phone are free !

Mainline stoppage, cleared after roughly 35 ft
After filter cleaning
before filter cleaning
2 inch water line leak
repair for 2 inch water line leak

+50

Response time4 hrs
Response rate93%
1 neighbors recently requested a quote
Avatar for Magnolia Heating & Cooling Inc
Magnolia Heating & Cooling Inc
4.7(
819
)
Geothermal Heating or Cooling System - Install

Serving Ontario, CA and surrounding areas

In business since 1951

Free estimates

Warranties offered

"Jacob did an awesome job from start to finish. He arrived on time, was very courteous and professional. He quickly diagnosed the problem and was able to get the condenser going again for us. In addition, he answered all my questions and even went further to conduct a full review of all the parts of the system. He provided me with great details regarding my ac system, proving his knowledge and expertise. He had some great suggestions on how to improve the system, but he didn't do a hard sell or try any funny business, which I always appreciate from service providers. Our AC is back on and working great, and we owe it Jacob and the folks at Magnolia Air Conditioning. We will definitely be using this company again for our heating and cooling systems needs.
"
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+17

Recommended by93%of homeowners
Avatar for Southland Heating and Air Conditioning
Southland Heating and Air Conditioning
4.7(
160
)
Geothermal Heating or Cooling System - Install

Serving Ontario, CA and surrounding areas

In business since 1997

Free estimates

Emergency services offered

"SOUTHLAND HEATING AND AIR IS UNIQUE AS FAR AS I KNOW IN THAT AFTER A SERVICE CALL THEY SEND A "FEEDBACK EMAIL" IN WHICH YOU ARE ABLE TO GRADE THE SERVICE YOU JUST RECEIVED. THE FIRST "CHECK UP" BY ANOTHER EMPLOYEE DIDN'T GO SO WELL...BUT THANKS TO THE FEEDBACK EMAIL...JUSTIN READ IT AND RESPONDED TO MY CONCERNS QUICKLY. HE TOOK CARE OF THE PROBLEM WITH SPEED AND FAIRNESS. FIVE STARS!!!"
This is the outdoor unit that offers 17 SEER Hyper efficiency and super quiet operation of 54db's compared to 80 plus on older units
notice the low profile, this is about 14 inch wide instead of the traditional 36 wide.
This replaces your old gas heater
Additional Photos
Additional Photos

+37

Response time1 day
Response rate100%
Recommended by93%of homeowners
Avatar for Water Heaters Only, Inc
Water Heaters Only, Inc
4.7(
440
)
Geothermal Heating or Cooling System - Install

Serving Ontario, CA and surrounding areas

In business since 1968

Free estimates

Emergency services offered

"My name is Leslie Rothenberg. Tony installed a Bradford White water heater on 6/4/18 (invoice #97307). The price was reasonable, the installation was done at the time promised (actually a bit earlier) in a very professional manner, Tony couldn't have been nicer and more helpful, and our old water heater was hauled away. I used an Angie's List coupon to get a 5% (maximum $50) discount."
Our technician Fabian getting ready to drain a water heater.
A newly installed 40 gallon residential water heater.
A tankless water heater installed in a garage.
Additional Photos
Additional Photos

+2

Recommended by94%of homeowners
Avatar for RKM Heating & Air Conditioning
RKM Heating & Air Conditioning
4.7(
380
)
Geothermal Heating or Cooling System - Install

Serving Ontario, CA and surrounding areas

In business since 2006

Free estimates

Emergency services offered

"RKM has provided excellent service and advice. There recommendations on equipment has provided us with a cool home through this record setting summer heat AND we have experienced a 50% reduction in our monthly energy expenses as a result of the new much more efficient HVAC system."
RKM heating and air conditioning services
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Additional Photos
Additional Photos

+11

Recommended by91%of homeowners
Home Comfort USA
4.3(
110
)
Geothermal Heating or Cooling System - Install

Serving Ontario, CA and surrounding areas

In business since 1977

Free estimates

Emergency services offered

"It was excellent. Chris Shay was excellent. He fully explained, was courteous and polite. He could see and understood why I had a previous bad experience with the install and cleaned up the mess that wasn't his that had previously left behind plus fixed other issues. He shared the pictures with his manager who also agreed that it was negative experience. He found that my account had fallen in the cracks and rectified the service that had been neglected. It was above and beyond my expectations. I look forward to him coming again to check up on the unit in 6 months. He also suggested and then installed an air cleaner which should help me with my health issues. All was accomplished today instead of being scheduled at a later date. I was very happy with him as he provided excellent service."
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Recommended by86%of homeowners
Xpress Heating & Air
5.0(
13
)
Geothermal Heating or Cooling System - Install

Serving Ontario, CA and surrounding areas

In business since 1999

Credit card accepted

"I highly recommend Xpress Heating & Air. Teresa was great, a true professional very friendly and knowledgeable. She explained the entire process to us , when installing our new A/C unit. Work was completed in a timely manner. We will contact her for all our future A/C needs for now on . Thanks Teresa"
Recommended by100%of homeowners
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