Endless Energy

Endless Energy is a Marlborough shop built around heat pumps, mini-splits, insulation, and MassSave-linked energy audits, with occasional plumbing calls mixed in. It holds an active Massachusetts HVAC license (934-SM-B) and Mass Save Partner status, and it's certified as a Massachusetts LGBT Business Enterprise. On Google, 614 ratings average 4.7★, and a handful of names keep coming up — CJ, Eydin, Mike, Aaron — each credited with walking customers through a diagnosis before touching anything. One review describes a furnace exhaust line that kept freezing in the cold; the technician traced the pitch, insulated 15 feet of exhaust pipe, and came back to confirm it held. Insulation jobs draw the same kind of detail: a 2026 review says a crew upgraded attic insulation, left the space cleaner than they found it, and even saved floor space the homeowner expected to lose. The friction shows up mostly around bigger installs and scheduling. A 2026 review reports an LG mini-split problem that went unresolved for two years across what it calls "many service visits." Two more from 2026 describe missed estimate appointments and repeat no-shows. Further back, a 2024 review of a heat-pump-to-oil-furnace conversion describes a bungled duct-insulation quote and months of missed appointments, and a 2021 EnergySage post says one mini-split zone stayed inadequate for over a year despite repeated promises to fix it. The company has been BBB-accredited since 2015 with an A+ grade, and its written record is heaviest on heat pump installs, mini-split repair, and insulation/energy-audit work tied to Mass Save — plumbing and solar show up only occasionally. Given where the complaints cluster, it's worth pinning down the installation timeline and getting the insulation or duct scope in writing before work starts.