What our neighbors
say about us.

"Furnace died at 9pm on a Sunday in January. I called expecting voicemail — Marcus picked up himself and was at my door before 11. Quoted the part, fixed it, $89 diagnostic taken right off the bill. The only HVAC company I'll call in Boulder."

"Three other companies told us we needed a $14k system replacement. Hearthstone showed up, ran a manometer test, and replaced a $40 sensor. The furnace has worked perfectly for two years. They could have taken the money."

"We signed up for HearthGuard after our second emergency call. Two years in, zero emergencies. Their spring tune-up caught a refrigerant leak before it killed our compressor. That single visit paid for the plan three times over."

"They quoted three options for our heat-pump conversion — efficient, premium, and best value — and walked us through the math on each. We went with the mid-tier and the install was on time, neat, and exactly the price quoted. The rebate paperwork was already filled out for us."

"Elena's whole approach is different. No pressure, no doom-and-gloom. Just facts about our system and what made sense. We've moved twice in Boulder and Hearthstone followed us both times."

"AC died at 7am the day we hosted a wedding rehearsal dinner. Hearthstone had a tech in our living room by 10:30, working in 95-degree heat in the attic. They billed us $89 for the diagnostic and $340 for the repair. Saved the entire weekend."

"I've used a half-dozen HVAC companies over twenty years in this town. Hearthstone is the only one that ever sat down and explained what they were doing in language I understood. I'm 78 — that matters."

"They turned down our job because we were just outside their service area, then spent ten minutes on the phone recommending three other shops. We called the first one. He was great. Who DOES that?"

"Smart-thermostat install, new filter media, and a humidifier — done in a single afternoon. Tech walked through the app with us until we both got it. Zero upsell pressure. Just thoughtful work."