Sierra Heating & Air ConditioningSierra Heating & Air ConditioningReplacing a furnace in Baltimore generally costs $3,500 to $7,500 installed, with most homes near $5,000. Green Street HVAC handles removal, install, and haul-away, sizing units for older Canton and Federal Hill rowhomes where duct access varies.
| Furnace type / home size | Typical installed cost range |
|---|---|
| 80% AFUE gas furnace (rowhome / small home) | $3,500 – $4,800 |
| 90%+ AFUE gas furnace (mid-size home) | $4,800 – $6,200 |
| 95%+ AFUE condensing furnace (larger home) | $6,000 – $7,500 |
| Electric furnace | $3,000 – $5,500 |
| Add: new venting or duct modifications | $500 – $2,000 |
Estimated Baltimore furnace replacement cost by type and home size
A furnace is sized in BTUs to match a home's heating load. Baltimore rowhomes of 1,000–1,500 sq ft often need 40,000–60,000 BTU units, while detached homes in Roland Park or Guilford may require 80,000–100,000 BTU furnaces. Oversized units short-cycle and wear out faster; undersized units run constantly. Proper sizing follows a Manual J load calculation, not a rule-of-thumb. Correct sizing keeps installed cost and long-term energy bills in the expected range.
AFUE (Annual Fuel Utilization Efficiency) measures how much fuel a furnace converts to heat. An 80% AFUE furnace is the budget option. A 95%+ AFUE condensing furnace costs $1,500–$2,500 more but converts nearly all fuel to heat, cutting gas usage over Baltimore's cold season. Condensing units require a PVC condensate drain and different venting, which adds to the install. The efficiency premium generally pays back over the furnace's 15–20 year lifespan.
The installed cost includes removal and disposal of the old furnace, the new unit, connections, and startup testing. Baltimore City requires a permit for furnace replacement, and licensed HVAC work must meet local mechanical code. Homes needing new gas lines, electrical work, or duct transitions carry added labor. A done-for-you install means the crew handles the lifting, hauling, and cleanup. The $150 minimum service charge applies to diagnostic-only visits.
Baltimore's older housing stock affects furnace replacement cost. Formstone rowhomes in Canton, Fells Point, and Locust Point often have tight utility closets and existing venting that must be adapted for a new unit, which can push jobs toward the higher end. Historic homes in Bolton Hill, Mount Vernon, and Charles Village sometimes have gravity-era ductwork requiring modification. Larger detached homes in Roland Park and Guilford typically need higher-BTU units. Baltimore City requires a mechanical permit for furnace replacement, and BGE offers periodic rebates on high-efficiency (95%+ AFUE) gas furnaces — worth confirming at time of install. Hampden and Federal Hill rowhomes commonly fall in the $4,000–$5,500 installed range.
A gas furnace in Baltimore typically lasts 15 to 20 years with regular maintenance. Homes with hard water, poor filtration, or skipped tune-ups may see shorter lifespans.
Most Baltimore rowhomes of 1,000–1,500 sq ft need a 40,000–60,000 BTU furnace, confirmed with a Manual J load calculation rather than square footage alone.
Replacing both together often saves on labor since the crew is already on-site, and matched systems run more efficiently. It usually makes sense when both units are near end of life.
Yes. Baltimore City requires a mechanical permit for furnace replacement, and the work must be performed to local code by a licensed HVAC contractor.