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TRUSTED BY RANDOLPH, NJ HOMEOWNERS

  • Average homeowner rating star icon4.7
    Average homeowner rating
  • Verified reviews icon278
    Verified heating and air conditioning services reviews

Top-Rated Heating and air conditioning pros in Randolph - Updated Nov 2026

Avatar for No 1 Cleaners
No 1 Cleaners
4.8(
295
)
Air Ducts & Vents - Clean

Serving Randolph, NJ and surrounding areas

Approved

In business since 1996

Free estimates

Emergency services offered

"I needed a whole house cleaning from the vents to the floors in the new home I bought. No. 1 provided all the services in one and they seemed reasonably priced. Vincent came on time and we went through all the things I wanted done in detail. He quoted me a price and he got to work. Many hours later, the house is amazingly clean and the dryer and HVAC unit is more efficient. The stains came out of the carpet and the tile was returned to original. The dust in the duct was also removed. In regards to the tile floor, I thought the grout was black, but after the cleaning it turned out that the original color was gray. Amazing! We also looked in the dryer vent and realized it had never been cleaned. I can't believe how much stuff came out of a short vent hose. I'm really glad I had it done. As to the professional who came to the house, Vincent was outstanding. He explained everything clearly, was very professional and did the work to the best of his abilities paying attention to detail. I couldn't have asked for more. I would definitely recommend No. 1 and Vincent to others who need the service."
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+13

Response time9 hrs
Response rate100%
16 neighbors recently requested a quote
Avatar for ABCastello's Heating and Cooling
ABCastello's Heating and Cooling
4.6(
101
)
Central A/C - Service or RepairElectric Boiler or Radiator Heating System - RepairElectric Boiler or Radiator Heating System - Repair - For Business+15 more

Serving Randolph, NJ and surrounding areas

Approved

In business since 2005

Free estimates

Emergency services offered

"Desmond is a very professional, knowledgeable and tact! Well priced for service and a regular down to earth, no bs, straight to the point and honest man. I appreciated his work and how he took the time to explain what was the issue and the how s and whys of the heating system. I will now use him for all my hvac needs and he s already gonna come back to do more work that I need done! Gentleman all around."
Air conditioning installation
A/C compressor replacement
410A charging system
Oil-Gas conversion
Propane-Gas conversion

+24

Response time11 hrs
Recommended by95%of homeowners
Avatar for Speer Air
Speer Air
4.6(
165
)
Central A/C - InstallGas Furnace / Forced Air Heating System - InstallElectric Furnace / Forced Air Heating System - Install+7 more

Serving Randolph, NJ and surrounding areas

Approved

In business since 1958

Free estimates

Emergency services offered

"I have used Speer Air for several years for HVAC preventive maintenance at my home. We recently expanded and they installed a package unit to take care of the expansion space. The work was good and they have been back for adjustments as necessary."
Residential Attic Install
Commercial Multi Unit Install
Guardian Series
Response time2 days
Response rate100%
6 neighbors recently requested a quote
Avatar for Phase II Development, LLC
Phase II Development, LLC
4.5(
47
)
Central A/C - InstallDuctless Mini-split A/C - Install or ReplaceGas Furnace / Forced Air Heating System - Install+7 more

Serving Randolph, NJ and surrounding areas

Approved

In business since 2005

Free estimates

Emergency services offered

"My tenant reported an issue with the HVAC on a Sunday. I called Robert @ Phase II at noon on a Sunday and he had someone over to resolve the issue within a couple of hours. Great customer service. I will definitely use Phase II in the future. Thank you!"
Furnace Heaating Repair
Commercial Ice Machine
Commercial Ice Machine Service
Commercial Ice Machine Cleaning
Deli Case Repair

+12

Response time3 hrs
16 neighbors recently requested a quote
Recommended by95%of homeowners
Avatar for MDL Electric LLC Cooling & Heating
MDL Electric LLC Cooling & Heating
4.6(
134
)
Central A/C - InstallGas Furnace / Forced Air Heating System - InstallCentral A/C - Service or Repair+4 more

Serving Randolph, NJ and surrounding areas

Approved

In business since 2007

Free estimates

Emergency services offered

"Miguel and his MDL electric team are very reliable and performed all services when promised, on time, and all work was done correctly. I had a small issue with with a scratch in the ceiling after a new HVAC cover was installed and Miguel had one of his workers respond quickly and correct the issue. MDL also offered a very competitive price and made me feel comfortable from the beginning. MDL replaced a really old electric panel and removed really old HVAC and installed all new HVAC. Would hire MDL again."
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Response time1 day
8 neighbors recently requested a quote
Recommended by93%of homeowners
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Heating and Air Conditioning FAQs, answered by experts

No, you don’t need a ductless unit in every room. Ductless AC units don't work the way that window units do, where the air doesn't travel outside that room. The indoor air handlers all attach to the outdoor condenser. While the air doesn't travel the way that traditional ductwork would, the ductless AC units create zones so that one part of the home can be cooler than another. They can spread effectively enough that indoor units only need to be placed in main living areas.

As a general rule, you should have your HVAC system professionally serviced at least once a year, though it's best to follow the manufacturer's specific recommendations. Many experts suggest twice-yearly maintenance: once in the spring for the cooling system and once in the fall for the heating system. This is especially recommended for older units, systems with recurring issues, or heat pumps that provide both heating and cooling. Regular service, which can cost between $100 and $550, keeps the system running efficiently, helps prevent costly future repairs, and saves money on utility bills.

Don’t run your AC with a wet filter. It can cause your AC to work too hard, which will run up your utility bill and cause extra wear and tear on the system. You could also spread moisture and mold throughout your house. Turn off the AC, remove the wet filter, and check for cracks or clogs. Fix the problem (with a pro’s help, if you need it), and put a dry filter in place before you turn the system back on.

Condensation forms when warmer, outside air combines with cooler air in your ductwork. This can happen when there are leaks in your air ducts, your HVAC system has a dirty air filter, or there’s a lack of insulation around the ducts. To prevent it from happening, replace your HVAC filters as directed. Also, once every five years, hire a local air duct cleaner to clean and inspect them.

Yes, it’s important to turn off your AC sometimes to give it a break and prevent it from freezing up. If your AC runs all the time, your system’s parts will wear down quicker, which may mean that you need to replace it sooner. Plus, using your AC constantly uses more electricity and leads to higher energy bills.

The Randolph, NJ 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.