Furnace Replacement Cost in Maryland: 2026 Pricing Guide

If your furnace is aging or facing a major repair, you're probably weighing replacement — and wondering what it costs. Here's a straightforward 2026 pricing guide for Maryland homeowners, including the choices that move the number up or down.

What Affects Furnace Replacement Cost

• Furnace size (BTU): Sized to your home's heat load, not guessed. An oversized furnace short-cycles and wears out early.
• Efficiency (AFUE): An 80% AFUE furnace costs less upfront; a 90%+ high-efficiency condensing furnace saves fuel every winter but may require new venting.
• Burner staging: Single-stage is most affordable; two-stage and modulating furnaces deliver quieter, more even heat at a higher price.
• Venting and gas line changes: High-efficiency units vent differently and may need new PVC venting and a condensate drain.
• Ductwork and permits: Duct modifications and Montgomery County permit and inspection fees factor in.

80% vs. 90%+ Efficiency

The efficiency decision is really about how long you'll stay and how cold your winters run. In colder spots like Damascus, a high-efficiency furnace pays back faster because it runs more hours. For a home you'll sell soon, an 80% unit may make more sense. We show you the payback math either way.

Repair or Replace?

If your furnace is under 15 years old and the repair is isolated, fixing it usually makes sense. Replacement deserves serious consideration when the unit is 15+ years old with a major failure, when repairs are stacking up each season, or when a safety issue like a cracked heat exchanger appears. Our furnace repair team gives you an honest comparison rather than pushing a sale.

AFUE: The Number That Drives Your Winter Bills

A furnace's AFUE rating tells you how much of the fuel becomes usable heat. An 80% AFUE furnace sends 20% of its fuel up the flue as waste; a 90%+ condensing furnace captures far more, venting cool exhaust through PVC instead of hot gases through metal. That efficiency shows up on every winter gas bill.

The tradeoff is upfront cost and installation complexity. High-efficiency condensing furnaces need new PVC venting and a condensate drain, which adds to the install. In a colder, higher-elevation area like Damascus where the furnace runs many hours, the fuel savings pay back faster. For a home you'll sell soon or in a milder microclimate, an 80% unit may be the smarter spend. We calculate the payback for your specific situation.

Single-Stage, Two-Stage, or Modulating?

Beyond efficiency, burner staging affects comfort and price. A single-stage furnace is either full-on or off — affordable and simple, but it can cause temperature swings and cold spots. A two-stage furnace runs on a gentler low setting most of the time, ramping to high only in deep cold, for more even heat and quieter operation. A modulating furnace fine-tunes its output continuously for the steadiest comfort and best efficiency, at the highest price.

For most Maryland homes, a two-stage furnace hits the sweet spot of comfort and value. We help you match the staging to your home and budget as part of any furnace installation, and pair it with correct sizing so it performs the way it should — see our related guide comparing a heat pump vs. furnace if you're weighing fuel types.

Don't Forget the Install Quality

The best furnace installed poorly will underperform. Correct sizing, proper venting, and safe combustion setup matter as much as the equipment. Our furnace installation service handles permits and inspections and commissions every system for safety and efficiency. Get a free written quote by calling (831) 461-3437.