Start with licensing — it's the law here
Connecticut requires HVAC contractors to hold state licenses issued through the Department of Consumer Protection. Heating, piping, and cooling work falls under specific license classifications — the person doing the work (or their supervising journeyman/master) must be properly credentialed.
- Ask for the license number before anyone visits. Then verify it on the CT DCP license lookup. This takes two minutes and eliminates a shocking number of candidates.
- Check insurance. General liability and workers' comp — ask for certificates. If a tech gets hurt in your basement and the company has no coverage, the liability conversation gets uncomfortable fast.
- Unlicensed work voids manufacturer warranties. That 10-year parts warranty on the new furnace? Worthless if installed by an unlicensed contractor. Manufacturers check.
The load calculation test
This single question filters contractors better than any review site: "Will you do a Manual J load calculation before sizing my system?"
Manual J is the industry-standard method for sizing heating and cooling equipment based on your home's square footage, insulation levels, window area and orientation, air leakage, and local climate data. It takes real measurements and real time.
- Right answer: "Yes, we do a load calc on every replacement." (Then verify they actually do it — ask to see the report.)
- Wrong answers: "We'll match what's there now" / "We've been doing this 20 years, we can eyeball it" / "Bigger is better, you don't want to be cold."
Oversized equipment is the most common sizing error in Connecticut — it short-cycles, wears faster, dehumidifies poorly, and costs more upfront. The existing system was probably oversized too; "same as before" just repeats the mistake.
Quote anatomy: what "itemized" actually means
A proper HVAC quote lists, at minimum:
- Equipment make, model numbers, and efficiency ratings (AFUE, SEER2, HSPF2)
- Scope of ductwork modifications (or explicit statement that none are needed, with measurements to back it)
- Electrical work included (new circuits, disconnects, panel work)
- Refrigerant line set, condensate drainage, and thermostat
- Permit handling and fees
- Old equipment removal and disposal
- Labor warranty term (separate from manufacturer parts warranty)
- Start/completion timeline and payment schedule
A one-line quote ("New furnace installed: $6,200") isn't a quote — it's a price guess. You can't compare it against anything, which is exactly the point.
Get three quotes — here's how to compare them
- Normalize the scope first. If one quote includes ductwork fixes and another doesn't, you're not comparing prices — you're comparing different projects. Ask each bidder to quote the same scope.
- Compare equipment tiers, not brands. Most major brands (Carrier, Trane, Lennox, Rheem, Goodman/Amana, Mitsubishi for ductless) are reliable when installed correctly. Installation quality matters more than the badge — a perfect Goodman install outlasts a sloppy Trane install.
- Weight the labor warranty. A 2-year labor warranty vs. a 10-year labor warranty is worth real money and signals how much the contractor trusts their own work.
- Ask about rebates explicitly. "What Energize CT rebates does this equipment qualify for, and will you handle the paperwork?" Compare net-after-rebate prices.
Red flags
- "This price is only good today." High-pressure close tactics. A real quote is good for 30 days minimum.
- No license number offered. Or "we work under someone else's license." Walk away.
- Suggests skipping the permit. Tells you everything about their business practices.
- Won't put it in writing. Verbal quotes evaporate the moment there's a dispute.
- Demands more than a third upfront. 10–25% to schedule is normal; 50%+ is a cash-flow problem wearing a contractor costume.
- Badmouths every competitor by name. Professionals sell their own work; amateurs sell against others'.
- Can't explain why they sized it that way. "Trust me" is not a load calculation.
Green flags
- Does a load calculation without being asked twice
- Brings up rebates before you do
- Explains repair-vs.-replace honestly even when replacement pays them more
- Has been in business locally 10+ years (check the CT business registry, not just the website's "since" claim)
- Answers "what happens if this breaks in year three?" with specifics, not shrugs
Skip the cold-calling roulette. Get matched with a licensed Connecticut contractor and get an itemized quote you can actually compare. Request your free quote →
Contractor questions, answered
Should I use a big company or a small shop?
Both can be excellent. Big companies offer deeper benches for emergency response and often longer labor warranties; small shops offer the owner on the job and lower overhead. Judge the specific people and the quote quality, not the company size.
Are online reviews reliable for HVAC contractors?
Directionally. Look for patterns across dozens of reviews, not individual raves or rants. Be skeptical of companies with hundreds of five-star reviews and zero detail — and check how they respond to negative reviews; that's where character shows.
Should the estimator be the installer?
Not necessarily, but ask who will actually do the work and whether they're employees or subcontractors. Nothing wrong with subs, but you want to know who's in your basement.
What if the cheapest quote is way cheaper?
A quote 30%+ below the others usually means excluded scope (no permit, no ductwork, builder-grade equipment, no labor warranty) — or desperation. Ask them to itemize to the same scope as the others and watch what happens to the price.