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Monster Mechanical is a general contractor in Oak Ridge, NJ. Open: Mon–Sun Open 24 hours. Phone: (973) 697-9776. Average rating is 5.0 stars from 221 reviews. Website: http://www.monsterhvac.com/.
Monster Mechanical
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A service van for Monster Mechanical parked in a grassy area.
5.0 221 reviews Today Open 24 hours

Oak Ridge's HVAC Experts, Day or Night

25 years of heating and cooling mastery serving Morris, Sussex, and Passaic Counties around the clock.

About Us

When your furnace quits at 2 a.m. in a New Jersey winter, you need someone who actually picks up. Monster Mechanical has been that company for over 10,000 families across Northern New Jersey since the business was founded 25 years ago. Ed and his crew have built a reputation that earns five-star reviews not by accident, but by showing up fast, diagnosing problems honestly, and fixing things right the first time.

This is a family-owned operation rooted in Oak Ridge, and that matters. There's no call center, no runaround, and no inflated repair quotes designed to push you toward a sale you don't need. Customers from Sparta to West Milford and Vernon to Randolph keep coming back year after year because Monster Mechanical treats every service call like it belongs to a neighbor, not a ticket number.

With 221 reviews averaging a perfect 5.0 stars, the track record speaks for itself. Whether your aging boiler has finally given out or you're converting from oil to natural gas, this is the team that gets it done, and gets it done properly.

What We Offer

Monster Mechanical covers the full spectrum of residential and commercial HVAC, so you're never left hunting for a second contractor. On the cooling side, they handle everything from seasonal tune-ups and refrigerant leak detection to full air conditioning installation and commercial AC projects. On the heating side, the list is equally thorough: gas and propane furnace repair, oil heating system service, hot water boiler work, and oil-to-natural-gas conversions that can cut your energy costs for years to come.

Beyond the core heating and cooling work, Monster Mechanical installs and services ductless mini-split systems, a smart solution for additions, garages, and older homes without existing ductwork. Indoor air quality is covered too, with air filtration and humidification installations that make a real difference through long New Jersey winters.

For homeowners who want peace of mind year-round, HVAC maintenance agreements keep systems running efficiently and catch small issues before they become expensive emergencies. And when something does go sideways unexpectedly, 24-hour emergency service and flexible HVAC financing mean you're never stuck waiting or stressing over the bill.

Why Choose Us

25 years of HVAC experience serving Morris, Sussex, and Passaic Counties with 10,000+ families served.
Perfect 5.0-star rating across 221 reviews, earned through honest diagnostics and reliable repairs.
Open 24 hours a day, 7 days a week, including weekends and holidays, for true emergency response.
Family-owned and locally rooted in Oak Ridge, NJ, with no call centers and no runaround.
Services all major HVAC brands, from Lennox furnaces to ductless mini-splits and commercial systems.
HVAC financing available so a broken system never has to become a financial crisis.

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What Our Customers Say

Don't just take our word for it - hear from our satisfied customers

Click to Rate & Review This Business ✍️
⭐⭐⭐⭐⭐
3 weeks ago
"My experience with Monster Mechanical was fantastic. Ed worked with me to provide the best time and most cost effective option for my boiler that I wasn’t reaching proper temperature. Ed was very friendly and professional. He had to order a part and this was during an extreme cold snap. He checked in regularly to make sure I was ok until the part arrived. That personal attention was amazing. I’ve found my new go to contractor for plumbing and HVAC!"
— Hoodwink
⭐⭐⭐⭐⭐
3 months ago
"After over 50 years of unbelievably reliable service, my Lennox brand gas furnace retired, no parts available. Due to the great experience with Lennox, I wanted another. I looked up dealers in my area, Monster Mechanical was the closest, and I am so glad they were, because Ed Kerr came with them! What a great, experienced and knowledgeable person he is, along with the even greater work team he has put together. His recommendations and discussions were genuinely helpful and I easily sensed he had my best interest at heart. Never tried to sell me or push more than I needed. The cold weather was right around the corner and somehow he fit me into his busy schedule because he was actually very concerned about me not having heat. The install took about half a day and it was very clear the work was highly, and professionally done! The cost was very reasonable for the quality of the work. It was such a pleasure and relief to work with an honest contractor and company. Ed knows and appreciates the value of having a long-term relationship with his customers, something that seems to be lost with many companies these days. I cannot recommend Monster Mechanical strong enough."
— Craig Decker
⭐⭐⭐⭐⭐
2 months ago
"We have been using Monster Mechanical as our HVAC Service company for many years. Whenever there was an issue, Ed was prompt to respond. After our heat was not working this time, we knew it was time for a new Lenox HVAC system to replace the old one. Ed and his team were very meticulous in getting a quality job done. We highly recommend Monster Mechanical for all of your HVAC needs."
— Daniel Stefans
⭐⭐⭐⭐⭐
2 months ago
"My furnace stopped working on a weekend. Ed responded immediately and was out to my house that morning. He was knowledgeable and professional and took the time to actually figure out the problem and solve it rather than just simply replacing a part. I really appreciate the time he took to get the furnace working again. I would absolutely use Monster Mechanical again for any heating or air conditioning issues."
— Kevin Stanton
⭐⭐⭐⭐⭐
5 months ago
"Monster Mechanical just finished replacing the 25 year old HVAC system in my home, and it was certainly a 5-Star experience! After my initial conversation with Ed, I knew he would be perfect for the job. He is very knowlegeable, experienced, genuine, and a pleasure to work with. He answered every question I had, and explained the logistics of the install. On the day of installation, Ed, and his terrific team, did impeccable work. Their attention to detail is impressive, and they left the work area spotless when the job was complete. Monster Mechanical is clearly a class act! Ed and his team will certainly be my new HVAC service provider."
— Barbara Kleiber

Frequently Asked Questions

What areas does Monster Mechanical serve?

Monster Mechanical serves residential and commercial customers throughout Morris, Sussex, and Passaic Counties. That includes Oak Ridge, Sparta, West Milford, Jefferson, Vernon, Butler, Roxbury, Randolph, Boonton, Dover, Hanover, Mine Hill, Riverdale, and surrounding communities across Northern New Jersey.

Does Monster Mechanical offer emergency HVAC service?

Yes. Monster Mechanical provides 24-hour emergency HVAC service every day of the week, including weekends and holidays. If your heat goes out in the middle of a winter night or your AC fails during a summer heat wave, you can reach them any time.

Can Monster Mechanical convert my oil heating system to natural gas?

Absolutely. Oil-to-natural-gas conversions are one of their specialties. The team handles the full process, from removing the old oil system to installing and commissioning the new gas equipment, and can walk you through the long-term cost savings before you commit.

What brands does Monster Mechanical service?

Monster Mechanical services all major HVAC brands. Their technicians have experience with Lennox, Carrier, Trane, Rheem, Bryant, and many others, so you don't need to worry about brand compatibility when you call.

Does Monster Mechanical offer maintenance agreements?

Yes. HVAC maintenance agreements are available for homeowners and commercial customers who want scheduled tune-ups, priority service, and the peace of mind that comes from keeping systems running efficiently all year. Pre-season AC and heating tune-ups are also available separately.

Does Monster Mechanical install ductless mini-split systems?

Yes. Ductless mini-split installation and service is a core part of what they offer. Mini-splits are a popular choice for home additions, finished basements, garages, and older homes that lack existing ductwork, and Monster Mechanical handles both the installation and ongoing service.

Is financing available for HVAC installations?

Yes. Monster Mechanical offers HVAC financing options to help make larger installations and replacements more manageable. If you need a new furnace, air conditioner, or full system replacement, ask about financing when you call for your estimate.

Hours of Operation

Open Now · Open 24 hours
Monday Open 24 hours
Tuesday Open 24 hours
Wednesday Today Open 24 hours
Thursday Open 24 hours
Friday Open 24 hours
Saturday Open 24 hours
Sunday Open 24 hours
79° Clear Oak Ridge
Tue 88° 68°
Wed 96° 74°
Thu 89° 68°
Fri 84° 61°
Sat 69° 63°
Sun 79° 63°
Mon 84° 65°

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