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Measured, then specified ยท 12,000+ installations

Heating Installation & Replacement

Furnace installation, boiler and heat pump replacement designed around a room-by-room load calculation and the ductwork you already have. The equipment is the last decision we make, not the first.

Sized for the House

Not for the label on the unit coming out, and not for the square footage on the tax record.

12,000+Systems installed
35+Years in the trade
RoomBy-room load calc
PermitPulled and closed
Financing available on system replacement
Mitsubishi Electric Diamond Contractor
Cold-Climate Heat Pump Certified
12,000+ Installations Since 1990
Licensed & Insured ยท #19HC00444000
More on the ICS YouTube channel
Watch ยท Making the call

Repair or Replace? How to Make the Smart Choice

Age, the part that failed, what the ducts are doing and how long you plan to stay. Four inputs decide this, and none of them is the pressure of a cold evening. Watch before you sign anything.

Design before equipment

Furnace Installation Begins With Arithmetic

The number that matters is heat loss: how much energy the building sheds on a design-temperature night, room by room. Wall construction, glazing, orientation, air leakage, insulation depth and volume all feed it. That figure sets the capacity of the equipment, and nothing else should.

The habit in this trade is to read the plate on the old unit and order the same thing. It is quick and it is usually wrong, because that unit was often oversized when it went in, and because the house has changed since โ€” new windows, a finished attic, insulation added, an extension built. Copying the nameplate copies somebody else’s mistake and locks it in for another twenty years.

Oversizing is not a harmless margin either. A furnace with more capacity than the house can absorb satisfies the thermostat fast, stops, and starts again a few minutes later, so the ignition components take a beating, the cabinet swings hot and cold, and the far bedroom is still cold because the burner never ran long enough to move air out there.

So we measure the house, then we measure the duct system that has to carry the air, and only then do we put equipment on paper.

  • Room-by-room load calculation on every replacement quote
  • Existing duct system measured and priced honestly
  • Gas, heat pump, dual-fuel and ductless options compared side by side
  • Permits pulled, inspection scheduled, paperwork closed out
Request an Estimate

What Sets the Specification

Heat LossRoom by room, at design temperature, from the building itself.
Duct CapacityWhat the trunk and branches can actually deliver, measured.
Fuel & VentingGas line capacity, chimney condition, sidewall venting routes.
AccessAttic, crawl space or tight basement stair โ€” it changes the plan.
Scope of work

What a Replacement Project Covers

A heating installation is six pieces of work, and the equipment is only one of them. Skipping any of the other five is how a new system ends up performing like the old one.

Load Calculation

Measured envelope, glazing and volume turned into a heating load for each room. It decides capacity, and on a zoned job it decides where the zones go.

Duct Evaluation

Trunk and branch sizing checked against the airflow the new equipment needs. Undersized returns get opened up before the system goes in, not blamed afterwards.

Equipment Selection

Single-stage, two-stage or modulating gas; cold-climate heat pump; dual fuel. We show what each choice buys in comfort and running cost before you pick a tier.

Oil to Gas Conversion

Tank decommissioning, gas service and line sizing, chimney liner or a switch to sidewall venting, and the utility coordination that has to happen in order.

Permits & Inspection

The municipal mechanical permit is pulled in your town, the inspection is booked, and the job is not finished on our books until it is signed off.

Commissioning

Airflow set, gas pressure adjusted to the manufacturer’s figure, temperature rise landed inside the plated band, controls configured and the readings handed to you.

Why install with ICS

Twenty Years of Consequences

A heating system you buy this autumn is a decision you live inside until the middle of the next decade. It deserves an afternoon of measurement.

Engineered, Not Guessed

Every proposal carries the load figure it was built on. If you get a second quote, you can compare the arithmetic and not just the brand.

Our Own Crews

The people who priced the job are the people who fit it, and the same company services it afterwards. Nothing gets handed to a stranger.

Rebates Handled

New Jersey utility and state programs move often. We check what your equipment qualifies for and prepare the submission with the job.

Financing on Replacement

Heating systems rarely fail at a convenient moment. Financing keeps a cold week from forcing a twenty-year decision in an afternoon.

The project

From First Visit to Signed Inspection

  1. Survey the Building

    An hour or so in the house. Rooms measured, insulation and glazing recorded, ducts opened up and looked at, gas line and venting traced, access routes worked out.

  2. Proposal With Options

    Usually three routes at different efficiency tiers, each with the same load figure behind it, what it changes about comfort, and any rebate it opens up.

  3. Fit Day

    Old equipment removed, new unit set, plenums and venting fabricated to suit, condensate and gas connections made, electrical and thermostat wired.

  4. Commission and Close Out

    The system is balanced and measured into spec, you are walked through the controls, and we meet the inspector so the permit is closed properly.

Planning a New Heating System?

Book the survey now and the work happens on your calendar rather than on the coldest week of the year. Estimates across Northern New Jersey and New York City.

Before you buy

Installation Questions

When should I replace my furnace?

Plan it in the shoulder season of the year the unit turns fifteen, rather than reacting the night it quits. Three things push the date forward: rooms that have never been comfortable, running cost climbing while usage stays flat, and a second significant repair inside two winters. Replacing on your own schedule means the survey is unhurried, the equipment is chosen rather than whatever is on the shelf, and the crew can do the duct work the house actually needs.

What size furnace do I need?

Whatever the load calculation says, which is usually less than the unit coming out. There is no reliable shortcut from floor area โ€” two houses of identical size in Ridgewood can differ enormously depending on glazing, insulation and how leaky the envelope is. Anyone who sizes your system from square footage over the phone is quoting a box, not designing a heating system.

Can I keep my existing ductwork?

Often most of it, sometimes not the returns. Older Northern New Jersey systems were built around furnaces that pushed less air, and modern equipment โ€” particularly a heat pump โ€” needs more of it at a lower temperature. We measure what the duct system can carry before quoting. Where the answer is not enough, the fix is usually a larger return path and a few resized branches rather than a whole new system of ducts.

What drives the price of a heating installation?

Five things, in roughly this order: the heat loss of the house, which sets capacity; the efficiency tier and staging you choose; the condition of the ductwork and how much of it has to change; venting and gas or electrical work, which is where oil conversions and attic units get expensive; and access โ€” a walk-in basement is a different job from an attic reached by pull-down stairs. Every quote we write itemises those, and financing is available.

How long does a furnace installation take?

A straight swap in an accessible basement is usually a single day. Add sheet metal changes, a new flue liner or a second zone and it becomes two. Oil to gas conversions and attic air handlers run longer because the utility, the tank contractor and the inspection have to be sequenced. We give you the number of days at proposal, and if the heat has to be off overnight we say so upfront.

Do I need a permit to replace a furnace in New Jersey?

Yes. Heating equipment replacement is permitted work in New Jersey municipalities and the inspection is part of the job, not an optional extra. We pull the permit in your township, book the inspector and attend. Unpermitted equipment surfaces later at the worst moment โ€” a sale, an insurance claim, or a rebate application that gets rejected for want of a closed permit.

Is an oil to gas conversion worth doing?

Where gas is already in the street, usually yes โ€” you lose the tank, the deliveries and the annual nozzle-and-filter routine. The work is more than the appliance: tank removal or abandonment, service and meter sizing with the utility, a liner or a new vent route, and often a smaller boiler or furnace than the oil unit it replaces. Where gas is not in the street, a cold-climate heat pump is now the serious alternative and may qualify for state incentives.

What do I get when the crew leaves?

Commissioning figures for your own records โ€” airflow, gas pressure, temperature rise and the control settings we programmed โ€” plus the permit reference, the equipment registration lodged with the manufacturer, and any rebate submission we filed on your behalf. The registration matters: parts coverage from most manufacturers depends on the unit being registered promptly after the install.

Where we install

Replacement Work Across the Region

Survey visits and installation crews from three New Jersey offices. Sussex and Warren are scheduled as planned projects, which suits replacement work well.

Start the survey

Get a Measured Proposal

Tell us about the house and the system in it. We will arrange a survey visit and put numbers behind whatever we recommend.

(866) 749-6331Talk to an estimator
mail@icshvac.comSend plans, photos or a current quote
Carlstadt (shop & warehouse)736 Gotham Parkway, Carlstadt, NJ 07072
Belleville (main office)267 Cortlandt Street, Belleville, NJ 07109
Englewood Cliffs120 Charlotte Place, Suite 201, Englewood Cliffs, NJ 07632
Home improvement contractorNJ Lic. #13VH00607800 ยท Master HVACR #19HC00444000

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Leaky ductwork can w

Leaky ductwork can waste conditioned air before it ever reaches your rooms. Proper duct sealing helps improve airflow, reduce energy loss, and create more consistent temperatures throughout your home.

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Indoor humidity affe

Indoor humidity affects more than comfort. Too much moisture can make your home feel sticky, while air that is too dry may cause irritation and discomfort.

Proper HVAC operation and humidity control can help create a healthier, more comfortable indoor environment throughout the year.

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๐ŸŒฟ Cleaner indoor

๐ŸŒฟ Cleaner indoor air can make your home feel more comfortable and healthier. Changing filters, improving airflow, and scheduling routine HVAC maintenance can help reduce dust, allergens, and other airborne pollutants.

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Your HVAC system oft

Your HVAC system often gives warning signs before a bigger problem develops. Test your thermostat, listen for unusual sounds, watch for moisture near drain lines, and keep the outdoor unit clear.

A quick response can help protect your comfort, prevent avoidable damage, and support reliable system performance all season long.

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