Serving New Haven & Fairfield Counties
24/7 Emergency Service
Fully Licensed & Insured
Free Estimates & Financing Options
Est. 2000
Oil. Gas. Propane. Heat Pumps. Air Conditioning.
We Service And Install It All!
A&S Nathan Heating & Cooling LLC is a family-owned business serving New Haven and Fairfield Counties for over 20 years. We specialize in HVAC service and installation, with a commitment to quality, reliability, and 24/7 emergency service. Free estimates and financing options available—your comfort is our priority.
SERVICES
Heating
Ensure your home stays warm and cozy with our expert heating services, providing reliable solutions for all your needs.
Learn More
Air Conditioning
Stay cool and efficient with our expert air conditioning services, ensuring comfort and savings all season long.
Learn More
Water Heaters
Enjoy consistent hot water with expert water heater services—heat pump, tank, and on-demand systems tailored to your home.
Learn More
Indoor Air Quality
Breathe easier with our indoor air quality services, designed to create a healthier and cleaner home environment.
Learn MoreWhy Choose A&S Nathan Heating and Cooling LLC?
Choosing A&S Nathan Heating & Cooling LLC means partnering with a team known for reliability, expertise, and trusted service throughout New Haven and Fairfield Counties. Established in 2000, we bring 25+ years of experience delivering quality HVAC service and installation backed by deep industry knowledge. We’re also an approved EnergizeCT contractor and part of the EnergizeCT Heat Pump Installer Network, helping homeowners take advantage of eligible heat-pump rebates and incentives.
As a local, family-owned business, we pride ourselves on personalized care and a strong connection to the community. Our HomeAdvisor Pro certification reflects our professionalism, and we’re honored to be the 2024 Pulse Award winner for Excellence in Customer Satisfaction. Trust A&S Nathan for dependable comfort—every season, every service.
- Service Contracts
- HVAC Service & Installation
- Installation, Repair, & Service—all fuel types
- Estimates Received Within 24 Hours
- Mitsubishi Elite Diamond Dealer
- Pulse Award Winner
Ways To Save
At A&S Nathan Heating & Cooling LLC, we offer smart ways to make comfort more affordable. Save with flexible financing, manufacturer incentives, rebates, low-interest loan programs, and federal tax credits. We also provide preventative maintenance plans to help you avoid costly repairs, plus specials and exclusive offers throughout the year. Let us help you find the best savings for your home.
Brands We Specialize In
Navein
Bradford White
Weil-McLain
Thermo Pride
Rheem
Bosch
Riello
Boyertown
Regal
American Standard
Ruud
Utica
Burnham
Mitsubishi Electric
Peerless Boilers
Bock Water Heaters
Real Reviews. Real Customers.
We finally decided to switch to natural gas in our house and we were looking for a heating and cooling contractor to do it all! Gas in the house, furnace, central air and an on-demand w— Mark Pastor
…
I called A&S Nathan when the furnace in a home I was selling went and needed to be replaced asap to not jeopardize the sale. They responded immediately. The job was done quickly and— Colleen Scott
…
My AC stopped working during a heat wave. I called A&S Nathan Heating & Cooling LLC, and they were able to come within two hours to diagnose and fix my system. They are fast, re— Amanda Schaefer
…
We have used A&S Nathan for years to service our oil burner and our air condition. They also installed a ductless AC in our first floor which we love. We decided to update our heat— Laurel Sorrentino
…
Can’t say enough about this company. Awesome service from first call to fixing my AC. When all other local companies told me two weeks, A&S Nathan did the job immediately and— Matt Muccioli
…
A&S came out to install a new A/C condenser and air handler in my home. They arrived on time, covered my wood floors with drop cloths and worked hard all day in the extreme heat. Th— Lori Marco
…
My furnace kept going in and out on a cold day . Even though they couldn’t fix my old furnace (30+ years old) on the initial service call , the tech was very thorough in diagnosin— John Crowley
…
I had my first experience with A&S Nathan HVAC on April 29, 2025. Making the appointment was a breeze. Received cordial service over the phone. On the day of the service (tune-up an— Daria Anderson
…
Scott from A&S Nathan is my go to for issues with my home and local business. He is always quick to respond and provides top notch work. I trust A&S Nathan and recommend them fo— Michael Schmitt
…
