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Top-Rated Furnace / forced air heating system install or replace pros in Dover - Updated Nov 2026

Avatar for MSD Heating & Cooling
MSD Heating & Cooling
4.9(
74
)
Boiler or Radiator Heating System - Install or ReplaceBoiler or Radiator Heating System - Install or Replace - For BusinessBoiler or Radiator Heating System - Repair or Service+43 more

Serving Dover, NJ and surrounding areas

Approved

In business since 2002

Free estimates

Emergency services offered

"I was very happy with my experience using this company. In the middle of a heat wave, right before the July 4th holiday, my AC stopped working. The man who installed it and had been servicing it was too busy to come for a week. I called MSD and was given an appointment for 8 AM the next morning. They were prompt and courteous, fixed my problem, and were reasonably priced. I will be calling them in the future."
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+1

2 neighbors recently requested a quote
Recommended by96%of homeowners
Avatar for ABCastello's Heating and Cooling
ABCastello's Heating and Cooling
4.6(
101
)
Electric Boiler or Radiator Heating System - RepairElectric Boiler or Radiator Heating System - Repair - For BusinessElectric Furnace / Forced Air Heating System - Repair+14 more

Serving Dover, NJ and surrounding areas

Approved

In business since 2005

Free estimates

Emergency services offered

"Our oil burner began emitting Carbon monoxide (CO) early one morning and stopped working. We called several repair services and no one called us back in a timely manner. We found AB Castello's on Angie's List, completed the Angie's List form and Desmond from AB Castellos called us immediately. Robert arrived less than an hour later. The first thing he did when he arrived was check for CO emissions. He then determined that our 16 year old furnace needed to be replaced. Later that day we received an estimate via email, had all of our questions answered on the phone, and arrived the next morning prepared to remove and replace our furnace. Desmond and Robert worked all day, into the evening, in order to install the new furnace. They were determined not to leave us one more night without heat. They were very polite, pleasant, neat and did an excellent job. I would highly recommend this company should you need service of any kind. Their response time was better than almost any other contractor we have hired, and their work excellent. They also cleaned up very well before leaving our home, and were very careful as they carried equipment in and out of our house. I cannot speak highly enough of them"
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 All Weather Heating & Cooling
All Weather Heating & Cooling
4.5(
70
)
Electric Furnace / Forced Air Heating System - InstallGas Furnace / Forced Air Heating System - RepairHeat Pump - Install or Replace+43 more

Serving Dover, NJ and surrounding areas

Approved

In business since 1969

Free estimates

Emergency services offered

"We were desperate to find someone to repair our central air conditioning unit. We were not able to move into the house and everyone that we called was not able to accommodate us because of the recent heat wave. All Weather was able to get a technician to us within 2 days. Nuri was amazing and showed my husband how everything worked and what repairs needed to be done. By the time he left, we had a cool house and were able to set up our movers. Thanks to Angie’s list, I found a reputable company that was reliable and efficient. We can rest easy! Thank you!!!"
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+13

Response time3 days
7 neighbors recently requested a quote
Recommended by94%of homeowners
Avatar for Dawson Mechanical Contracting
Dawson Mechanical Contracting
4.8(
136
)
Boiler or Radiator Heating System - Install or ReplaceBoiler or Radiator Heating System - Install or Replace - For BusinessBoiler or Radiator Heating System - Repair or Service+29 more

Serving Dover, NJ and surrounding areas

Approved

Super Service Award Winner

In business since 1988

Free estimates

Emergency services offered

"It went well. Not sure how many years it's been but Dave continues to solve the many riddles around our boiler (house circa 1930). This time was not so bad but I simply don't call anyone else PERIOD. Waste of time when you can work with a savant. Just as an FYI - he's pretty much done my entire basement from PEX to a water filtration system."
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+20

Response time7 hrs
Response rate99%
Recommended by92%of homeowners
Avatar for Speer Air
Speer Air
4.6(
165
)
Electric Furnace / Forced Air Heating System - InstallGas Furnace / Forced Air Heating System - InstallDuctless Mini-split Heating System - Install or Replace+5 more

Serving Dover, NJ and surrounding areas

Approved

In business since 1958

Free estimates

Emergency services offered

"Speer Air just completed a complete overhaul of my existing HVAC including an upgrade of part of our system. The entire experience from initial sales visit to completion was great. Throughout the installation, the team was friendly, always available to answer a question, clean and respectful of my 3 young children (making sure nothing was left behind or any debris that could hurt them). System is operational and very satisfied. Highly recommend them."
Residential Attic Install
Commercial Multi Unit Install
Guardian Series
Response time2 days
Response rate100%
5 neighbors recently requested a quote
Avatar for Phase II Development, LLC
Phase II Development, LLC
4.5(
47
)
Gas Furnace / Forced Air Heating System - InstallDuctless Mini-split Heating System - Install or ReplaceElectric Boiler or Radiator Heating System - Install+5 more

Serving Dover, NJ and surrounding areas

Approved

In business since 2005

Free estimates

Emergency services offered

"Robert is fantastic! You can see that he takes great pride in his work! He is a truly a pleasure to deal with. He did a great job of removing an old oil burning furnace and installing a new gas furnace. Thorough, neat, professional - and friendly, too! I highly recommend Phase II Development!"
Furnace Heaating Repair
Commercial Ice Machine
Commercial Ice Machine Service
Commercial Ice Machine Cleaning
Deli Case Repair

+12

Response time3 hrs
17 neighbors recently requested a quote
Recommended by95%of homeowners
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FAQs for furnace / forced air heating system install or replace projects in Dover, NJ

Converting from an oil furnace to an electric furnace isn't a simple swap—the oil system needs to be completely removed before installing the electric furnace. You'll need a full electric system installation, but you might be able to reuse existing ductwork if it's up to current safety standards. You’ll need to budget for a new electric furnace installation, which costs between $1,800 and $6,200, including professional removal, proper disposal, and safe installation of the new system.

Electric furnaces are 100% efficient at converting electricity into heat. However, some of that heat can be lost as it travels through your home's ductwork or escapes through poorly insulated areas. That's why regular duct maintenance and proper home insulation are important to maximize your furnace's efficiency and reduce heat loss, ensuring consistent warmth and lower energy costs.

With proper maintenance, an electric furnace can last anywhere from 20 to 30 years, outlasting the average gas furnace's lifespan of 15 to 20 years. To keep your electric furnace running efficiently, schedule regular cleanings, tighten connections, and have inspections done before winter arrives. With routine maintenance, you’ll ensure consistent, safe heating for years to come.

The size of the electric furnace you need depends on factors like your home's square footage, climate, and insulation quality. As a general guideline, those who live in warmer climates should multiply their square footage by 30 to 35 BTUs, while those in cooler areas should multiply it by 50 to 60 BTUs.

Consulting with an HVAC professional can help you determine the exact size that's right for your home.

An electric furnace works by converting electricity into heat using high-resistance heating elements. A blower then pushes the warm air through your home's ductwork, distributing heat evenly throughout your space. Since there's no combustion involved, electric furnaces eliminate the risks associated with gas furnaces and provide consistent, reliable heating when properly installed.

An electric furnace uses between 40 and 80 kilowatts per day to heat your home. The exact amount it uses depends on factors like your home's size, insulation, and overall energy requirements. Larger homes or those with poor insulation use more energy than smaller, well-insulated spaces. A professional furnace assessment can help confirm the ideal unit size for your needs.

The Dover, NJ homeowners’ guide to furnace / forced air heating system installs or replaces

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