Get matched with top thermostat installers and replacers in Rancho Santa Margarita, CA

"Trinity Heating installed a new thermostat in my house. The technician, Jimmy, was professional and courteous. After the installation he took the time to explain to me how to set up and use the new thermostat. I’m completely satisfied with their service and will use them again if needed."

"Christian installed a new thermostat and he was incredibly professional knowledgeable and nice I would Recommend Excel to To anyone looking for heating and air and I don’t usually write reviews but these guys were great!"

"George and his crew replaced my 27-year-old heater and A/C, and did an amazing job! The job included putting in a new digital thermostat. They even completely lined the inside of the little shed that houses the heater with insulation — which it never had before. They completed this big project in just a single day! I am extremely happy and satisfied with the work and highly recommend this company!"

"I highly recommend this company. Penguin heating & Air was very quick to respond to my request, fast text reply, sent them pics, they replied with a quote, which was way lower than anyone else on this site, or even our regular guy that we normally use, we scheduled an appointment for the very next day, which was today, he also finished the job the same day! David did a very good job, very professional. Despite a terrible rainy day, he got the job done. When he was done he walked me through with exactly what he did. He also quoted me for a service on an existing unit and his quote was almost $200 less than what our regular guy charges us... We will absolutely be using this company again."

"Went well. had kitchen faucet replaced & drain clog snaked clear."

"We had a split mini system installed.. They removed old A/C,@ducts in attic and condenser outside and hauled away.. They are expensive, but they do quality work. Technicians well trained and know what they are doing. Friendly and very neat.."

"I scheduled for a 4:00 appt, left them a message requesting if we could do earlier - they called and accommodated me on my service time change. Very happy my air is back on!"

"I shopped around quite a bit before choosing True Air. Pete was very knowledgeable and didn't try to push or oversell me on anything. Matt and the crew were very professional, efficient and friendly. Installation was straightforward and quick. The crew were very respectful of my house & property and quick to clean up any messes. I would definitely recommend them to anyone looking for a replacement HVAC system."

Here at One Hour Heating & Air Conditioning of Mission Viejo, When homeowners want a reliable air conditioning and heating system that they don’t have to think about, they call One Hour Heating & Air Conditioning. We are the leading HVAC service provider in the Mission Viejo and the surrounding areas for a simple reason: we actually care about your comfort.\n\nAt One Hour Heating & Air Conditioning® of Mission Viejo, we respect you, we respect your time, and, most importantly, we respect the trust that you put in us to keep your home comfortable. It’s why we back all of our work with a 100% customer satisfaction guarantee for two years, and it’s why we’re always on time—guaranteed.\n\nOur customers love what we do because we treat them like the neighbors they are to us. We back our work with a 100% satisfaction guarantee, provide StraightForwardPricing® guides for your benefit, and will pay you back for being even one minute late to an appointment.\n

"Jonathon replaced our AC units and provided us with various options regarding the installation. He was communicative, knowledgeable and responsive to our needs. I would highly recommend him."