How Much Does a New Furnace Cost?
A new gas furnace installed in Frederick costs about $3,000 to $7,500 in 2026 for most homes. The price is set by two things: the AFUE efficiency rating and the size of the unit your house needs. A standard 80% AFUE furnace sits at the low end. A high-efficiency 96% to 98% condensing furnace runs higher because it burns less gas and needs different venting. Bigger homes need larger units, which cost more. The final number also depends on your existing ductwork, gas line, and how hard the old unit is to remove.
New furnace cost by type and efficiency (Frederick, 2026)
| Furnace type / AFUE | Typical installed cost |
|---|---|
| Standard single-stage, 80% AFUE | $3,000-$4,500 |
| Two-stage, 90%-92% AFUE | $4,200-$5,800 |
| High-efficiency condensing, 95%-96% AFUE | $5,000-$6,800 |
| Modulating condensing, 97%-98% AFUE | $6,000-$7,500+ |
| Add-on: new PVC venting or gas line change | $400-$1,500 extra |
What drives the price of a new furnace
Efficiency is the first lever. An 80% AFUE furnace sends 20 cents of every gas dollar out the flue, and it is the cheapest to buy. A 96% condensing unit wastes almost nothing, so it costs more upfront but trims your winter bills. Over a Frederick heating season, that gap can pay back a real part of the difference. Size is the second lever — a larger home needs more heating output, and bigger units cost more.
Installation work moves the number too. A condensing furnace needs PVC venting through a sidewall, so switching from an old 80% unit can add venting and drain lines. An undersized gas line, a tight closet, or worn ductwork all add labor. A proper quote for furnace installation in Frederick should list the unit, the AFUE, and every add-on as a separate line so you can compare bids fairly.
- AFUE rating: higher efficiency raises the price but lowers gas bills.
- Home size: bigger houses need larger, costlier units.
- Venting and gas line changes add $400 to $1,500 to many jobs.
Getting an honest number for your home
Skip the phone estimate. A trustworthy price comes after a technician measures your home and checks the ductwork, gas line, and venting. Two furnaces of the same brand can cost very different amounts once the install details are counted. Ask each contractor to quote the same AFUE and size so you compare like for like — knowing which AFUE rating you need keeps the bids on equal ground.
Timing matters as well. Booking in spring or fall, outside the winter rush, often gets you better scheduling and pricing. Also plan around the install itself, since knowing how long furnace installation takes helps you set aside the right day. Ask about warranty terms and Maryland efficiency rebates too, because those can shift the true cost more than a small price gap between brands.
- Get an in-home quote, not a phone guess.
- Compare bids at the same AFUE and furnace size.
- Ask about warranties and Maryland efficiency rebates.
Questions homeowners ask next
How Much Does a New Furnace Cost?
Most Frederick homeowners pay $3,000 to $7,500 for a new gas furnace installed in 2026. An 80% AFUE unit sits at the low end, while a 96%-plus condensing furnace costs more but lowers gas bills. Home size, venting, and gas line work move the final price.
Is a high-efficiency furnace worth the extra cost?
Often yes in Maryland. A 96% condensing furnace costs more upfront but wastes almost no gas, so it trims bills across a full Frederick heating season. The colder your winters and the longer you plan to stay, the more the payback makes sense.
Why is my quote higher than the base furnace price?
Add-ons. New PVC venting, a larger gas line, ductwork fixes, or a tight install space all add labor and materials. A good quote lists each item separately so you can see exactly what raises the total.