Endless Energy

Endless Energy, based in Marlborough, is the call homeowners make for a heat pump, AC unit, or furnace that needs installing, tuning up, or fixed at 2am in the middle of a heat wave. Its Massachusetts HVAC license (934-SM-B) is active, and Google puts it at 4.7 stars across 614 ratings, a volume built up over more than a decade of reviews spread across several sites. What keeps showing up in the last six months isn't a slogan, it's a handful of first names. CJ traced a furnace exhaust line that kept freezing, re-pitched it, and insulated 15 feet of attic ductwork rather than just resetting the unit. Hiram and his crew swapped a dying AC system for a heat pump and, per one reviewer, "walked us through it all," including the Mass Save rebate paperwork. Arron pulled a three-year-old mini-split apart for an internal cleaning a customer said had never been done before, and another reviewer had Dan handle an electrical service upgrade and stuck around to explain each step. It hasn't been clean across the board. A one-star review from June describes an LG mini-split and combi-boiler system installed in 2024 that's still blowing warm air and cycling through service visits, with the free warranty window now expired and a $2,500 repair quote on the table. Another recent review describes a scheduled estimate visit where nobody showed, with a company rep admitting the no-show came down to an internal miscommunication. A third reviewer liked the technician who eventually came but was frustrated that an 8am appointment was cancelled at 7am and had to be escalated to a manager just to get someone out by 11:30. This is a fit for a straightforward heat pump, AC, or furnace job where you want the person doing the work to explain what's wrong before they start fixing it — that's the pattern across dozens of recent reviews. For anything more involved, like a combined mini-split and boiler retrofit, it's worth asking upfront how they handle a system that isn't right after the first visit, and getting the labor warranty terms in writing before the crew leaves.