Dempsey Energy

Dempsey Energy is a North Attleborough oil-and-HVAC company — furnace and boiler installs, oil burner service, and central air and mini-split work — carrying a 4.6-star Google rating across 964 reviews and a BBB A+ accreditation, numbers built on a large volume of daily service calls. The reviews describe a rotating cast of well-liked technicians by name — Robert, Matt, Xavier, Charles, Dave, Bob, Tim, Wayne — showing up for everything from routine tune-ups to full furnace and boiler installs, several finished the same day a system failed. One installer spent a full day in a 100-degree attic replacing a dead AC system and, per the homeowner, never lost his good humor; another returned the same visit to fix a hose mishap he'd caused. The recurring theme worth knowing before calling is price transparency around diagnostics and repairs. Several reviews — spanning 2024 into 2026 — describe being charged a flat diagnostic fee ($220–$350) that didn't lead to a fix, or quoted repair costs the customer felt were close to full replacement price: one reported a 2025 quote of $2,600 for a mini-split control board with no breakdown of parts cost, another a nearly $900 bill for a 20-minute pinhole-leak repair. A 2026 review described a $1,300 thermostat-install charge with no wiring involved, after a deposit was taken. A separate review, dated January 2026, said a $2,200 repair left the home without heat for three months despite repeated calls to the office for a callback that kept slipping. For routine maintenance, tune-ups, and installs, the volume of positive, detailed reviews naming specific technicians is substantial and consistent across years. For anything that turns into a bigger repair estimate, it's worth asking for an itemized quote — including the diagnostic fee — before work begins.