The furnace is running. You can hear it. The house is still cold. That is a different problem from a furnace that will not start, and it usually has a different cause. Novus Mechanical takes no-heat calls across Freehold and Monmouth County, and the first job is separating a furnace that has failed from a furnace that is working fine and losing the heat somewhere between the burner and your living room. Our diagnostic visit is $150 and can reach $200 on a harder call, with the repair price given before any work starts.
There are three families of cause, and they need different fixes. The furnace is not making heat, the furnace is making heat but shutting down early, or the furnace is making heat that never reaches the rooms.
Not making heat usually means the burners are not lighting at all, which is an ignition problem. Making heat but shutting down early is the most misdiagnosed of the three: the furnace overheats, trips its high limit switch, cools, and restarts, so it runs constantly and heats poorly. That is nearly always airflow, and a clogged filter or a closed-off return causes it more often than a failed part.
Making heat that never arrives is a duct problem, not a furnace problem. Leaky or undersized ductwork in an unconditioned attic or crawlspace dumps a large share of what you paid to heat into a space nobody lives in.
We measure rather than guess, because the three look similar from the thermostat and cost very different amounts to fix. Replacing a furnace that was never broken is the expensive mistake here.
On a no-heat call we run through the same measurements every time:
If the numbers say the furnace is doing its job, we stop looking at the furnace. That is the whole reason we test before quoting, and it is why we do not sell equipment to solve airflow problems.
| What you notice | What it usually is | What we measure to confirm |
|---|---|---|
| Runs constantly, house never warms | Overheating and tripping the limit switch | Static pressure, temperature rise |
| Blows air that feels cool | Burners not lighting, or a fan setting left on | A full ignition cycle, thermostat fan mode |
| Warm near the furnace, cold at the far end | Duct leakage or a starved run | Airflow at the register, duct leakage test |
| One room only | Distribution, not the furnace | Room by room airflow, air balancing |
| Short bursts, over and over | Short cycling on a safety, often airflow | Static pressure, cycle timing on the limit |
The diagnostic visit is $150 and can reach $200 on a harder call. Most repairs start at $350, and you get the price before we start.
What the visit buys you is the actual answer. Plenty of Monmouth County homeowners have paid for a new furnace when the real problem was a return duct that was never sized for the system, and the new furnace short cycles exactly like the old one did. The measurements cost a fraction of the equipment, and they tell you which conversation you are actually having.
If the answer turns out to be ductwork rather than the furnace, we will say so, and the fix moves to airflow work rather than a replacement.
No, and it is worth separating them before you call anyone. A whole house that will not come up to temperature points at the furnace or the main duct trunk. One room that never matches the rest is a distribution problem, and a new furnace will not fix it.
That second one is common in Freehold and Marlboro homes with a bedroom over the garage or a converted back room. The furnace is fine. That room simply never got the airflow it needed, sometimes since the house was built. Air balancing measures and corrects it room by room.
Also worth ruling out before booking: a thermostat set to "on" rather than "auto" will blow room-temperature air between heating cycles, which feels exactly like a furnace that has stopped working.
The 1960s and 1970s ranches and split levels around Freehold Township, Howell and parts of Manalapan were built with duct systems sized for the original equipment, and most have had at least one furnace replaced since. When the new unit went in, the ducts usually stayed as they were.
A modern furnace moves air differently than a fifty-year-old one and it is far less tolerant of restriction. Put a high-efficiency unit on undersized returns and it will run high static pressure from day one, trip its limit, and heat unevenly for the rest of its life while everyone blames the furnace.
Newer developments in Marlboro and Colts Neck have a different pattern, where the duct runs are long and the far bedrooms starve. Same symptom, different cause, and both are measurable.
We work out of Freehold and cover the surrounding parts of Monmouth County: Marlboro, Manalapan, Colts Neck, Holmdel and Howell. Residential homes only.
Repairs are scheduled Monday through Friday, 8 AM to 6 PM, and the phone is answered any time day or night so you can get on the schedule when it happens. If the house is cold and you are not sure whether it is an emergency, call and we will talk it through.
We measure your home, explain what we find, and hand you one clear price. Book a consultation in Freehold or Monmouth County.
Updated August 2026 by Novus Mechanical, Freehold, NJ
