Mitsubishi Diamond Dealer

diamond shape to be changed later

Services Provided

Central Air Installations:

 - Ducted

 - Ductless Split A/C & Heat Pumps

A/C Seasonal Maintenance

A/C Repairs

Boiler and Furnace Cleanings

Boiler & Furnace Repairs

Oil Tank Installations

Water Heater Installation

Water Heater Service

Save 1/3 on your home heating costs

Free in home consultations

Emergency service 24/7

Call Today for details

Our Business Ethics

All work is diagnosed, and the work and price of the repair is explained to you before the work begins. This allows the homeowners to approve the repairs and costs. There are no surprises!

CT Contractors Licenses


The S1 category is the doctorate of HVAC. It is an Unlimited Heating, Air Conditioning, Water Heating, Duct installation and Gas piping license.

* When hiring a contractor, request to see the license. They are proud to show it!

Better Business Bureau Accredited

Welcome to All Phase Heating and Cooling Contractors, LLC

HVAC Products from Simple to Simply the Best

At All Phase Heating and Cooling Contractors, LLC, we install a wide range of heating and air conditioning products to fit every home owner’s budget, needs and energy efficiency goals. We choose top quality brands to ensure longevity and peace of mind, because your home is your castle. When it comes to the expertise of getting the job done right, our technicians are factory certified and are trained to care for the equipment and your home with care and precision. Some of our air conditioning and heating systems will not only make your home more comfortable, but will pay you back every month in savings! It’s a wonderful thing when being comfortable can also give you a return of investment.


Unexpected Repairs

No need to fret. We understand how important that hot shower is. If the air conditioning in the home is on the fritz and the weather man says the mercury is on the rise, our 24 hour emergency team is standing by to revive your system and to get your home running smoothly again.


Scheduled repairs and seasonal maintenance

An ounce of prevention is worth a pound of cure when it comes to heat & air conditioning systems but sometimes break downs sneak up or strange noises arise and need attention. Rest assured. Our friendly staff will help schedule your heating & cooling repairs at a time that’s right for you because we understand your busy schedule.

We install systems along the shoreline from Guilford to Stonington and many points in between. Following the installation of your system, all service repairs and installations come with written warranty details. Twenty-four hour emergency service is available to all clients, and no service contract is required. All work is diagnosed, and the work and price of the repair is explained to you. This allows the customer to approve the repairs and costs. There are no surprises!