Complete Comfort Systems Inc

One hundred and fifty-one permits and a BBB accreditation running back to 2004 — Complete Comfort Systems has been pulling heating and plumbing permits around Haverhill longer than most of its competitors have existed. The company trades publicly as Climate Zone from 230 Essex Street in Haverhill, with Andrew DiPietro as president and 29 employees on BBB's file. The work splits between comfort systems and wet trades: furnaces, boilers, heat pumps, central and ductless air conditioning, indoor air quality, oil-to-gas conversions, and the plumbing side — water heaters, gas piping, cross-connection devices. BuildZoom's permit records lean plumbing and gas, with a typical permit value near $2,400, which fits a shop doing a high volume of everyday replacements rather than a handful of big installs. BBB rates them A+ and has accredited them since 2004; BuildZoom scores them 97, in the top 18% of Massachusetts licensed contractors, and confirmed an active Massachusetts Home Improvement Contractor registration. That combination — long accreditation, active registration, deep permit history — is the strongest part of the picture. The reviews are thinner than the permit trail suggests. HomeAdvisor shows 4.6 from 12 reviews spread across more than a decade, with the recurring praise landing on punctuality and crews that explain the job and clean up after themselves. Set against that, two complaints in the history are worth weighing: a heat pump installation that the customer says never heated properly, raised on their BBB page and not shown as resolved, and a HomeAdvisor reviewer who found the timeline communication on a repair effectively absent. That pattern points somewhere useful. For a straightforward swap — water heater, boiler, condenser — the record is consistent. For a whole-home heat pump conversion, where sizing and cold-weather performance are the whole ballgame, get the heat-loss calculation in writing along with the design temperature the system is sized to, and ask what happens if it underperforms in January. Also worth a check: BuildZoom lists a Massachusetts plumbing business licence it has not verified, showing a May 2026 expiry, and several old City of Newton contractor entries as inactive. Ask for the current plumbing licence number and confirm it yourself alongside the HIC registration.