EarthTech Systems LLC

EarthTech Systems LLC is a Tyngsborough, Massachusetts heating and cooling contractor whose work is overwhelmingly geothermal — ground-source heat pump design, installation and long-term service — with air-to-water and mini-split heat pump work alongside it. The Better Business Bureau lists the company under Heating Contractors, and homeowners routinely name the same handful of people: Terry on design and project coordination, Ryan and Elijah on install and service calls. The deepest praise comes from whole-system conversions. A homeowner who replaced an oil burner and hydro-air system with geothermal in February 2026 described the team as responsive and reliable from start to finish, with back-up heat and hot water supplied through a cold-weather changeover and follow-up checks after completion. Another February 2026 review covered a groundwater heat pump in a 2,400 square foot house that came in on budget with no surprises, including help with the MassSave rebate paperwork. A 2023 review detailed a 3-ton water-to-air ground source system on two 360-foot closed vertical loops in an 1890s house, noting the bid was higher than planned but tracked closely with another respected specialist's. Service work draws the most consistent repeat praise. Reviewers describe quick diagnosis and explanation of what was done, a Sunday email answered by a phone call the same day, and a midnight visit during a cold snap where the technician brought space heaters when the part turned out to be unavailable. One customer whose previous installer abandoned the job mid-project described a multi-day evaluation and a detailed written report. Another said the company paused service billing while a manufacturer defect was chased down, then worked with the manufacturer to recover costs. Price is the recurring thing to settle before signing. A 2026 reviewer gave three stars for exactly that: strong technical knowledge and explanation, but cost that ran incredibly high. On Reddit in 2023, a Massachusetts homeowner comparing geothermal proposals said EarthTech's came in at nearly twice a competitor's. Installation complaints, while a small minority, are specific and worth reading: a 2024 one-star review about a mini-split installation described equipment delivered differently from what was discussed and verbal assurances not honored, and urged getting everything in writing; another 2024 reviewer said installation mistakes on a heat pump cost more than twenty thousand dollars; a 2023 reviewer alleged dishonesty over a replacement tankless boiler part. Smaller friction shows up too — a part not ordered for a second-floor damper, and one reviewer who never received a promised quote. For a geothermal conversion or ongoing service on an existing ground-source system in northeastern Massachusetts, this is a specialist with real depth. Get the scope, equipment model and every verbal commitment written into the contract, and get a second geothermal bid so you can judge the price.