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TRUSTED BY DENNIS, MA HOMEOWNERS

  • Average homeowner rating star icon4.6
    Average homeowner rating
  • Verified reviews icon211
    Verified heating and air conditioning services reviews

Find Heating and air conditioning pros in Dennis

Avatar for Cotti-Johnson Heating-Cooling-Electrical
Cotti-Johnson Heating-Cooling-Electrical
4.7(
166
)
Electric Furnace / Forced Air Heating System - InstallGas Furnace / Forced Air Heating System - InstallDuctless Mini-split Heating System - Install or Replace+4 more

Serving Dennis, MA and surrounding areas

Approved (Corporate)

Super Service Award Winner

In business since 1948

Free estimates

Emergency services offered

"Excellent. 2 perfectionist electricians, Sam and Steve affiliated with Cotti Johnson HVAC & Electrical, completed the comprehensive work with meticulous attention to details in half a day. They are knowledgeable, kind professionals. If I need any electrical work in the future, they are the first to contact in my list."
Navien Install
Backflow
Outdoor Shower
Well Tank Replacement
Filtration Installation

+62

Response time10 hrs
69 neighbors recently requested a quote
Recommended by89%of homeowners
Avatar for Earth Green Dryer Vent & Duct Cleaning
Earth Green Dryer Vent & Duct Cleaning
4.6(
816
)
Air Ducts & Vents - Clean

Serving Dennis, MA and surrounding areas

Approved

Super Service Award Winner

In business since 1998

Free estimates

Emergency services offered

"Earth Green did an awesome job in cleaning out my HVAC system. Troy and Scotty were very professional and did the job with ease and high quality. I would definitely recommend these guys to anyone!"
 Before cleaning
 After cleaning
Truck Mount Duct Cleaning
Blower Motor Cleaning
Response time5 hrs
44 neighbors recently requested a quote
Recommended by95%of homeowners
Avatar for Cotti Johnson HVAC, Inc.
Cotti Johnson HVAC, Inc.
4.3(
63
)
Central A/C - InstallGas Furnace / Forced Air Heating System - InstallCentral A/C - Service or Repair+6 more

Serving Dennis, MA and surrounding areas

Approved

In business since 1944

Free estimates

Emergency services offered

"My electrician from Cotti-Johnson HVAC was a master electrician. If you get him, you are getting the best. I went with the most expensive work package of the 3 that were presented. First off, it was pricey. I knew that going in. I want Cotti-Johnson to understand that I am serious about a working relationship with them. I feel I have done that with their electrical department. Now, if I need their plumbing or HVAC service, our relationship can build off the first experience."
Home Standby Generator Installation
Home Standby Generator Installation
Home Standby Generator Installation
Home Standby Generator Installation
Home Standby Generator Installation

+56

Response time9 hrs
Response rate97%
101 neighbors recently requested a quote
Avatar for RLF Heating & Cooling Inc.
RLF Heating & Cooling Inc.
4.9(
10
)
Central A/C - Service or RepairCentral A/C - InstallHeat Pump - Install or Replace+3 more

Serving Dennis, MA and surrounding areas

Approved

In business since 2023

Free estimates

Emergency services offered

"Bob did a new mini split install for me and I couldn't be happier with the work. He was professional, timely, and had excellent communication. He was also very knowledgeable and made some great recommendations for the project. I'd recommend him to anyone looking for HVAC work."
Response time6 hrs
Response rate97%
6 neighbors recently requested a quote
Michael Faria Plumbing
5.0(
57
)
Central A/C - Service or RepairGas Boiler or Radiator Heating System - RepairGas Furnace / Forced Air Heating System - Repair

Serving Dennis, MA and surrounding areas

Approved

In business since 2018

Free estimates

Emergency services offered

Michael Faria Plumbing is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests, and make their concerns the basis of our business.

Response time4 hrs
11 neighbors recently requested a quote
Recommended by92%of homeowners
Avatar for Hoctor Built Homes and Property Management
Hoctor Built Homes and Property Management
4.2(
109
)
Ductless Mini-split A/C - Install or Replace

Serving Dennis, MA and surrounding areas

Approved

In business since 2006

Free estimates

Credit card accepted

Hoctor Built Homes has a single mission: Complete Customer Satisfaction and one call does it all services from landscaping to New Home construction. We pride ourselves in being the experts in the industry. Call us for a free quote today!

Response time2 days
Response rate85%
29 neighbors recently requested a quote
Avatar for Paul Foley Electric Co., Inc.
Paul Foley Electric Co., Inc.
4.7(
79
)
Ductless Mini-split A/C - Install or ReplaceDuctless Mini-split Heating System - Install or Replace

Serving Dennis, MA and surrounding areas

Approved

In business since 1992

Free estimates

Emergency services offered

At Premier Energy Solutions, your comfort and safety come first. We protect your home or business with turnkey, worry-free generator installations, HVAC systems, and electrical work — all backed by unmatched reliability and value.\n\nEvery project is handled by licensed professionals using top installation practices. From backup power to heating and cooling to electrical upgrades, we make it seamless, professional, and built to last.\n\nSince 1992, Premier Energy Solutions has grown from a licensed electrical contractor into a full-service power, comfort, and safety provider. We deliver a complete, turnkey experience — design, permitting, installation, testing, and support.\nGenerators. HVAC. Electrical. One trusted team.

15 neighbors recently requested a quote
Recommended by91%of homeowners
Avatar for Cape Cod Electrical, Inc.
Cape Cod Electrical, Inc.
4.9(
182
)
Electrical Baseboard or Wall Heater - Install

Serving Dennis, MA and surrounding areas

Approved

In business since 2015

Free estimates

Emergency services offered

Cape Cod Electrical is your hometown company! Nick McElroy was born and raised on Cape Cod, and knows how to solve all your electrical issues. We take extreme pride in our work and love what we do! We have been working on Cape Cod for a long time and understand the specific needs for our customers. We take the time to explain to you the issues you are having and discuss the options to repair it. We always offer upfront costs and never stray from the quoted price so there is no surprises at the end. He does it all, from generators, to remodels.No job too big or too small. Call him today, and sleep easier knowing, you have hired the best! State licensed Master Electrician and Generac Factory trained technician.

Ripped down service wire due to storm damage
After repair
After repair
Existing center light
New recessed lighting with pendent over island

+10

Response time2 days
Recommended by81%of homeowners
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Showing 1-10 of 187
Heating and Air Conditioning questions, answered by experts

No, you should not attempt to replace an AC evaporator coil yourself. This is a complex task that must be performed by a licensed HVAC technician. The process involves handling hazardous and flammable refrigerants, which poses significant safety risks. Attempting a DIY replacement can also cause further damage to your HVAC system and will likely void its warranty. It is necessary to hire a local AC repair professional for this job.

The standard rule for return duct sizing is that the return vent should be the same size or larger than the supply vent. This will ensure balanced airflow in your home and reduce strain on your HVAC system.

Freon will go in the refrigerant lines near the back of your AC unit. Look for small ports with caps on a thin copper line—the Freon goes into those ports. You are best off hiring a licensed HVAC professional who can complete the job safely and correctly.

If you don't clean your AC evaporator coils, dirt and debris will build up, which impairs the system's ability to transfer heat. This forces the unit to work harder, leading to inefficient performance, higher energy bills, and frequent breakdowns. Over time, neglected coils can corrode, which may cause refrigerant leaks, or develop mold, ice buildup, and a clogged condensate drain, resulting in poor air quality and an uncomfortable home.

Most HVAC companies recommend against setting your AC below 70 as it could freeze up the system and cause more problems. Regardless of how hot it is outside, there is generally a 20 degree difference between the outside and inside temperatures, so even if it’s 100 degrees outside, your AC will likely not be able to cool your home to 70 degrees.

The Dennis, MA homeowners’ guide to heating and air conditioning services

From average costs to expert advice, get all the answers you need to get your job done.