AC & Heating Repairdiagnostic first β parts priced up front$140 β $680
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Every service below has its own page and its own Princeton price list.
Part of the Sure Lock & Key family β serving homeowners across 7 states, including Connecticut and Texas.
We check county records for homes like yours β no signup, no site visit.
Your hvac repair & install is priced from the Princeton price list, with the system size estimated from those records β correct it in one tap.
Add your name and phone after the price. Continue online for a window, or finish with a callback.
Backed by 35+ years in the home-services industry
24/7 emergency service β live operators, not voicemail
Professional, fully-trained and background-checked pros
An individual approach β and an exact flat rate β for every job
Mobile service vans ready to assist you on-site
All of our hardware and work are fully covered and guaranteed
"I called when I lost my keys... excellent service!"
"Eric the mobile pro came out very quickly... wonderful service."
"Fast, professional, and the price was exactly what they quoted. Would recommend."
Every Zelli quote is a flat rate built for your home and your job β never a generic corporate estimate. You see the number upfront. That's the number you pay. No "we'll know once we get there." No hidden fees.
Every quote is a personalized flat rate for your home and your job β never a generic corporate estimate. You see the number before any work begins, and that's the number you pay.
Every pro on Zelli is background-checked, license-verified, and accountable to a flat-rate guarantee.
We started Zelli after one too many "we'll know once we get there" calls. Now we don't take any.
We check county records for your home's size and age so we bring the right system size and your price is fixed before a tech is dispatched.
We never sell or share your address. It is used only to price this job and send your pro β nothing else.
βBooked an AC tune-up. Flat rate up front, no haggling. Done in an hour.β