Furnace installation and replacement in Sheboygan County.

Furnace replacement cost is driven by six things, and the furnace itself is only one of them: the efficiency and staging you choose, what the venting has to change to, the condition of your return air and ductwork, electrical work, permits and disposal, and whether the air conditioner is being replaced at the same time. That is why two identical-looking houses can be thousands of dollars apart. We will not quote it over the phone. We measure, then we put a written number in front of you with the line items visible.

The only defensible way to answer that is a Manual J load calculation, and the answer is very often smaller than what you have now. Square-footage rules of thumb and matching the old nameplate are the two shortcuts that produced most of the oversized furnaces in this county. We do the calculation before we quote, not after.

An oversized furnace satisfies the thermostat before it has heated the house evenly, then shuts off. You get short cycles, temperature swings, cold rooms far from the furnace, more noise, worse filtration because the air is barely moving, and components that wear out from constant starting and stopping. It also costs more to buy. Oversizing is the most common installation mistake we find, and it is almost always because somebody matched the old unit instead of measuring the house.

AFUE is Annual Fuel Utilization Efficiency — the percentage of the gas you buy that ends up as heat in the house rather than up the flue. An 80% furnace loses a fifth of it; a 96% furnace loses four percent. In a Wisconsin winter there are enough run hours for that gap to matter, so high efficiency is usually the right call here. The thing to price properly is the venting change that comes with it, not the furnace.

A straight replacement in an accessible basement is normally a one-day job. It gets longer when the venting has to change route, when the return air needs rework, when an air conditioner or coil goes in at the same time, or when the mechanical space is tight. We will tell you which of those applies before the day, not on it.

Repair it if it is under about twelve years old, this is the first real repair, and the repair costs a small fraction of a new system. Lean to replacement past fifteen years with a second or third repair costing half a new system, or if the bills are climbing with no change in habits. A cracked heat exchanger is not a judgment call — that furnace gets shut off and replaced. The full decision is laid out on our furnace repair page.

Sometimes, but not with a two-stage or modulating furnace — those need a thermostat that can command the stages, or you will have paid for staging you never get. An old mercury or basic single-stage thermostat on new variable-speed equipment is one of the more common ways an install underperforms. We confirm the control before we order the equipment.

Most municipalities in the area require a mechanical permit for a furnace replacement, and where one is required we pull it. It matters more than people think: the inspection is an independent check on venting, gas and clearances, and an unpermitted install can complicate things when you sell the house.

Because in parts of Sheboygan County it runs near the top of the legal ANSI range, and modern furnaces mind that a great deal more than old ones did. A single-stage furnace from 1998 had almost nothing electronic in it. A variable-speed, modulating furnace is a computer with a burner attached, and sustained high supply voltage degrades those boards over a season or two. Measuring it takes a few minutes and occasionally changes what we recommend installing.