Top Heating Companies in Sussex County, NJ: 2026 Local Guide

Sussex County heats differently from the rest of New Jersey. About half of occupied homes here heat primarily with fuel oil, compared with roughly 6 percent statewide, and the typical house was built in the early 1970s, according to U.S. Census Bureau data. That mix of oil burners, propane, hot water and steam boilers, and newer heat pumps means the right contractor for one house can be the wrong fit for the house next door.

This guide compares seven licensed heating and HVAC companies with offices in Sussex County: where each is based, how long it has operated, the heating equipment it works on, how it handles emergencies, its maintenance plans, its manufacturer credentials, and its current Google rating.

How We Evaluated Sussex County Heating Companies

We started with the heating contractors that appear in Sussex County searches and on local review platforms, then kept only companies that met all four of these requirements:

• A physical business address in Sussex County.
• Furnace and boiler service described on the company’s own website.
• A New Jersey Master HVACR Contractor license tied to the company that showed as active in the state license lookup.
• A Google Business Profile with public reviews.

For each company we recorded the same facts from its website, BBB profile, Google Business Profile, and manufacturer dealer locators. Lennox, Trane, Mitsubishi Electric, and Carrier designations were confirmed on each manufacturer’s own site. Anything we could not confirm publicly was left out.

We did not score or rank the companies. Ratings are a snapshot and will change, and where a company’s sources disagree, the profile says so. Several contractors based in neighboring counties also serve parts of Sussex County; this edition covers companies with an office inside the county.

Top Heating Companies in Sussex County, NJ

The tables summarize what each company publishes. On a phone, scroll sideways to see every column.

*Google ratings as shown on September 22, 2026; Willco’s is for its Branchville profile. **Confirmed on each manufacturer’s dealer locator on the same date unless marked company-stated. Every company listed held an active New Jersey Master HVACR Contractor license on that date.

Willco Air Conditioning, Refrigeration & Heating Inc.

Willco was founded in Sussex County in 1988 and works from its shop at 15 Mill Street in Branchville. The company describes itself as family-owned and has local service pages for 13 Sussex County municipalities, including Newton, Sparta, and Vernon.

• Heating equipment: furnace repair for most makes, furnace installation and replacement, Lennox gas and oil hot water boilers and gas steam boilers, Lennox heat pumps including dual-fuel pairings, and Mitsubishi Electric ductless mini-splits.
• Oil-to-gas conversions: Willco coordinates with the utility, handles permits, and removes the old oil equipment as part of an oil-to-gas conversion.
• Emergency service: same-day service for heating emergencies, seven days a week except five major holidays. The office is open 7 a.m. to 5 p.m. on weekdays, and weekends are reserved for emergencies.
• Maintenance: the Service Partner Plan includes a tune-up with a written safety inspection, member discounts, no emergency surcharges, and a guarantee that a member’s service call is scheduled and completed within 48 hours. Plans cover gas, propane, oil, and heat pump systems.
• Credentials: Lennox Premier Dealer and Factory Trained on Lennox’s dealer locator; Mitsubishi Electric Diamond Contractor at the Elite level on Mitsubishi Electric’s contractor finder; BBB Accredited with an A+ rating; New Jersey Master HVACR license 19HC00421100.
• Reputation: 4.9 stars from 481 Google reviews.

Willco is one of two companies in this guide holding advanced dealer designations from two manufacturers, both confirmed on the manufacturers’ own sites, and it works on every heating fuel common in the county: oil, propane, natural gas, and electric heat pumps. Its furnace tune-up follows an 84-point checklist.

May be a strong fit for: homeowners who want one company for an oil boiler today and a heat pump or gas conversion later, and anyone who wants Lennox or Mitsubishi Electric equipment installed by a manufacturer-recognized dealer.

BSE Mechanical

BSE Mechanical is a plumbing and heating contractor at 195 N Church Road in Franklin. Its website traces the family’s trade roots to a West Milford plumbing business in 1954; BBB lists the company’s own start date as 2004. It serves homes and businesses in northern New Jersey and nearby New York.

• Heating equipment: furnace repair and installation, boilers, radiant heat, and ductless systems.
• Emergency service: emergency service on Saturdays and Sundays; weekday office hours.
• Maintenance: plan details are not published on its website.
• Credentials: listed in Carrier’s dealer locator; EPA certified, according to the company; New Jersey Master HVACR license 19HC00771700.
• Reputation: 4.9 stars from 612 Google reviews.

May be a strong fit for: homeowners around Franklin who want one licensed contractor for boiler, radiant heat, and plumbing work.

Dynamic Mechanical Service

Dynamic Mechanical Service (DMS) was founded in 2013 as a sole proprietorship serving oil burner customers in Sussex County. Based in Sussex, New Jersey, it serves the county and the wider tri-state area and works on residential, commercial, and industrial systems.

• Heating equipment: gas and oil furnaces, gas and oil hydronic boilers, and Mitsubishi Electric heat pumps and ductless systems, plus oil heat service and full oil-to-gas conversions.
• Emergency service: a 24/7 emergency support line; office hours 8 a.m. to 4:30 p.m. on weekdays.
• Maintenance: gas and oil service plans in Basic, Value, and Premium tiers.
• Credentials: Mitsubishi Electric Diamond Contractor on Mitsubishi Electric’s contractor finder; New Jersey Master HVACR license 19HC00628900.
• Reputation: 5.0 stars from 20 Google reviews.

May be a strong fit for: oil-heat households around Sussex and Wantage, and owners of small commercial buildings.

Hart & Iliff Fuel and Energy Systems

Hart & Iliff traces its history to 1889 and operates from 4 Hampton Street in Newton. It serves Sussex, northern Morris, and northern Warren counties and combines fuel delivery with heating and cooling service.

• Heating equipment: installation, maintenance, and repair of oil, gas, and electric heating equipment. Its product pages include boilers from Buderus, Peerless, and Lochinvar, along with Roth radiant heat systems.
• Fuel: heating oil delivery on an automatic or will-call basis.
• Emergency service: 24/7 emergency service for regular customers.
• Maintenance: Comfort and Presidential plans for automatic-delivery oil customers, plus a natural gas maintenance program.
• Credentials: the company states its technicians are New Jersey Master HVACR technicians or apprentices; New Jersey Master HVACR license 19HC00796300.
• Reputation: 4.8 stars from 98 Google reviews.

May be a strong fit for: households that heat with oil and want fuel delivery and burner service from the same company.

Perfection Contracting

Perfection Contracting says it has been family-owned and operated since 1975; BBB lists a 1982 start date. Based at 1 Camre Drive in Newton, it lists 21 Sussex County municipalities in its service area, along with other North Jersey counties and parts of New York.

• Heating equipment: gas and oil furnaces, hydronic and radiant floor boilers, ducted, ductless, and cold-climate heat pumps, geothermal systems, and oil-to-gas conversions.
• Emergency service: emergency calls taken 24/7; office hours 7 a.m. to 5 p.m. on weekdays.
• Maintenance: a Heating Service Plan with an annual tune-up, priority scheduling, and preferred repair rates, plus Premier plans that cover repairs to covered parts.
• Credentials: Trane Comfort Specialist with NATE certification on Trane’s dealer page; Mitsubishi Electric Diamond Contractor at the Elite level; New Jersey Master HVACR license 19HC00587000.
• Reputation: 4.8 stars from 109 Google reviews.

May be a strong fit for: homes considering geothermal, radiant floor heat, or a cold-climate heat pump, and owners of Trane equipment.

R. Poust Heating & Cooling

R. Poust works from 27 Wilson Drive in Sparta and says it has served Sparta homeowners for more than 45 years. Its service area covers Sussex and Morris counties and parts of neighboring counties, and it offers plumbing, drain, electrical, well pump, and water treatment services alongside heating and cooling.

• Heating equipment: gas and oil furnaces, gas and oil hot water boilers, heat pumps, and ductless mini-splits, plus oil-to-gas conversions that include removing the old tank.
• Emergency service: 24-hour emergency call service; office hours 8 a.m. to 5 p.m. on weekdays.
• Maintenance: a membership program and heating and heat pump service agreements.
• Credentials: describes itself as an authorized Lennox dealer and offers a one-year labor warranty on heating and cooling units it installs; New Jersey Master HVACR license 19HC00127600.
• Reputation: 4.8 stars from 3,310 Google reviews, the largest review count in this guide.

May be a strong fit for: households that want heating, plumbing, well, and water treatment work handled by one company.

Smith’s Heating & Cooling

Smith’s Heating & Cooling operates from 227 Main Street in Newton and says it has served the area since 2003. It markets itself as an oil and gas heating specialist and names Sparta, Franklin, Branchville, and Byram Township among the Sussex County communities it serves.

• Heating equipment: gas and oil furnaces; oil, gas, and steam boilers, including condensing models; hydronic and radiant systems; cold-climate ducted heat pumps and ductless mini-splits; propane equipment; and oil-to-gas conversions.
• Emergency service: advertises 24/7 emergency service.
• Maintenance: Choice, Custom Choice, and Gas service plans, plus an air conditioning plan.
• Credentials: Mitsubishi Electric Diamond Contractor on Mitsubishi Electric’s contractor finder; New Jersey Master HVACR license 19HC00402000.
• Reputation: 5.0 stars from 102 Google reviews.

May be a strong fit for: older homes with steam or oil systems, and homeowners weighing a switch from oil to gas or a heat pump.

How Sussex County Homeowners Should Choose a Heating Company

The right company depends on the system you have, the fuel you burn, and how you want service handled when something fails in January. Ask these questions before you sign anything.

• Does the company work on systems like mine? An oil-fired steam boiler, a propane furnace, and a cold-climate heat pump call for different skills and parts.
• Is the license active? New Jersey requires HVACR contractors to be licensed. Ask for the Master HVACR license number and check it in the Division of Consumer Affairs lookup.
• How do emergencies really work? “24/7” can mean a live dispatcher, an answering service, or priority for plan members. Ask whether a technician is sent overnight, what after-hours fees apply, and whether holidays are covered.
• What does the maintenance plan include? Compare visits per year, tune-up scope, how fast members are scheduled, repair discounts, and whether the plan requires buying fuel from the company.
• Are the manufacturer credentials current? Lennox, Trane, and Mitsubishi Electric publish dealer locators. Mitsubishi Electric extends its factory warranty to 12 years when an independent Diamond Contractor installs the system.
• Is the proposal written and itemized? For a replacement, ask how the system was sized. A heat-loss calculation is more reliable than matching the old unit.
• Which rebates and financing apply? Utility programs differ by utility and change often, so ask which ones apply at your address.

For a longer checklist, see our guide on how to choose an HVAC contractor.

Why Local Heating Experience Matters in Sussex County

According to the Census Bureau’s American Community Survey 2020 to 2024 estimates, about 48 percent of occupied homes in Sussex County heat primarily with fuel oil or kerosene, compared with roughly 6 percent statewide. Only about 20 percent use utility gas, versus 73 percent across New Jersey, and close to 11 percent rely on propane. A contractor working here has to be comfortable with oil burners, tanks, and propane equipment, not only gas furnaces.

The housing stock matters too. The median year built for Sussex County homes is 1973, and about 14 percent were built before 1940. Older homes often have hot water or steam boilers feeding radiators and ductwork that was not designed for modern equipment, so a good contractor evaluates how heat is distributed, not only the boiler or furnace.

Then there is the climate. The U.S. Department of Energy’s Building America climate guide classifies Sussex County as a cold climate (IECC zone 5A), and the county is home to High Point, the state’s highest elevation at 1,803 feet. Heat pumps can work well here when they are chosen for it: cold-climate models and dual-fuel setups, which pair a heat pump with a furnace or boiler for the coldest days, are the usual approaches.

Finally, with only about one in five homes on utility gas, an oil-to-gas conversion often starts with one question for the utility: does a gas main reach your street? A contractor who handles conversions across the county will know that process and the permits your town requires.

Frequently Asked Questions

Who provides emergency heating service in Sussex County?

Dynamic Mechanical Service, Perfection Contracting, R. Poust, and Smith’s Heating & Cooling publish round-the-clock emergency service. Hart & Iliff offers 24/7 service to regular customers, Willco provides same-day emergency heating service seven days a week, and BSE Mechanical lists weekend emergency service. Ask any contractor how after-hours calls are handled before you need one.

What should I look for in a heating contractor?

An active New Jersey Master HVACR license, experience with your fuel and system type, a clear emergency policy, written estimates, and recent reviews that mention work like yours. The checklist above covers each point.

How often should a furnace be serviced?

Once a year, ideally in early fall. Oil-fired furnaces and boilers also need an annual cleaning and burner adjustment, and because heat pumps run in both seasons, many contractors recommend servicing them twice a year. See how often to service your furnace for what a tune-up covers.

Should I repair or replace my heating system?

Weigh age, repair cost, and safety. Repair usually makes sense for a newer system with an isolated problem. Price a replacement when equipment is near the end of its expected life, repairs are becoming frequent, a heat exchanger is cracked, or you already plan a fuel change. For typical lifespans, see how long a furnace lasts.

Do Sussex County HVAC companies service boilers and heat pumps?

Yes. Every company in this guide works on boilers, and six of the seven publish heat pump or ductless services. If you have a steam system, a specific boiler brand, or a cold-climate heat pump, confirm that experience directly.

Can I switch from oil to natural gas in Sussex County?

Often, if gas service reaches your street. A conversion usually involves confirming service with the utility, pulling permits, installing a gas furnace or boiler, and handling the oil tank under local rules. Willco, Dynamic Mechanical Service, Perfection Contracting, R. Poust, and Smith’s Heating & Cooling all advertise conversions.

Schedule Heating Service With Willco

If you want a heating contractor that has worked in Sussex County since 1988, the Willco team in Branchville can help with furnace repair, boiler service, heat pump installation, oil-to-gas conversions, and seasonal tune-ups. Request service online, and ask about the Service Partner Plan if you want priority scheduling in place before the first cold snap.

Schedule Heating Service

Sources

Company websites (linked in each profile), Google Business Profiles, BBB profiles, the New Jersey Division of Consumer Affairs license lookup, and the Lennox, Trane, Mitsubishi Electric, and Carrier dealer locators, all checked September 22, 2026. Housing and heating fuel data: U.S. Census Bureau, American Community Survey 2020 to 2024, tables B25040, B25034, and B25035. Climate: U.S. Department of Energy Building America climate region guide.