How to Choose an HVAC Contractor in New Haven

Connecticut licenses HVAC work, and the license should be verifiable before anyone touches your system. Ask for the license number and check it; a legitimate contractor expects the question. Insurance matters equally: liability coverage and workers’ compensation protect you if something goes wrong in your basement. Permits are part of the job, not an optional extra — a contractor who suggests skipping the permit is cutting a corner you will pay for at resale or after an incident. For Wooster Square and other historic-district homes, confirm the contractor has handled Historic District Commission review before, since outdoor unit placement can trigger it.

This is the single best filter for contractor quality. A proper sizing uses a Manual J load calculation: measurements, window counts, insulation levels, and orientation. A contractor who sizes from square footage alone, or who quotes the same tonnage for your East Rock Victorian and your neighbor’s renovated condo, is guessing — and an oversized system short-cycles, leaves humidity behind, and costs more to run. In harbor-adjacent homes, where humidity is a large share of the cooling load, correct sizing is the difference between comfortable and clammy. Ask, plainly: ‘Will you run a load calculation?’ The answer should be yes, and it should be in the quote.

An itemized quote names, each on its own line: equipment make and model, efficiency rating, ductwork or distribution scope, electrical scope including any panel upgrade, permits, old-equipment disposal, oil tank handling where relevant, and warranty terms for both parts and labor. A single lump-sum number is not a quote you can compare — it hides whether the ducts, the panel, and the permits are included or conveniently forgotten. On a $10,000 job, the spread between a complete bid and a stripped bid is routinely several thousand dollars, and the stripped bid is not cheaper once the missing pieces are added back.

• Normalize the scope first. Make sure all three bids include the same equipment tier, ductwork, electrical, and disposal. Then compare prices.
• Compare warranties, not just prices. A cheaper unit with a short labor warranty can cost more within five years than a better unit with real coverage.
• Weight the load calculation. A bidder who measured and calculated has done real work; a bidder who eyeballed it has not.
• Check the rebate handling. Energize CT rebates should appear in the quote, with paperwork handled by the contractor.
• Trust the middle bid. On big HVAC jobs, the outlier-low bid usually omits scope and the outlier-high bid usually pads it. The middle bid is often the honest one.

• No license number offered, or a permit treated as optional.
• Sizing from square footage with no measurements.
• A lump-sum quote with no itemization.
• Pressure to sign today for a ‘today-only’ price.
• No mention of your panel capacity on a heat pump quote for an older home.
• No mention of historic-district review for a Wooster Square exterior install.
• A boiler quote that does not name steam vs. hot-water.

• Load calculation offered unprompted.
• Itemized quote with model numbers and warranty terms.
• Rebates mentioned before you ask.
• References from homes like yours — radiator homes, oil conversions, shore installs — not just new construction.
• A written timeline and a clear answer for what happens on the coldest night.