Best Heating & Air Conditioning / HVAC In North Andover

“This review is for an annual maintenance done in September 2025 for mini splits by Daniel Ruiz. He arrived on time, neat and very thorough. Made sure to wear booties inside the house and communicated well with us. He made sure everything was working perfectly and draining properly through our gutters. The one year old compressor had some insulation already splitting so he taped and secured it with some zip ties and took photos of the 12 year old compressors’ insulation that is disintegrating to get a quote to replace. Awaiting company to respond. Daniel is very experienced and highly recommend him.“

“I don’t often write online reviews, but this experience truly warrants recognition. Shawn recently replaced our water heater, and I couldn’t be more impressed with the quality of his work. The installation was completed efficiently, with great attention to detail, and at a very competitive price.

It’s clear that Shawn is in high demand—and for good reason. I feel fortunate to have secured his services, and I wouldn’t hesitate to recommend him to anyone seeking reliable and professional plumbing work.“

“The boiler installation the Giard team did was great. They showed up on time, walked me through the process. Brought me down to the basement to inspect the location of the new boiler. Actually finished early and walked me through on setting the DHW temp and the controls for the boiler. Can not say enough good things about the Giard team. Thank you all“

“We have been using Callahan for years and we have had nothing but 5 star service. In about a week from now we will be moving and had an issue arise with our AC. Nick was sent out the same day and repaired the problem in no time...with a smile. I can't recommend this business enough!“