If your furnace is over 15 to 20 years old, requires frequent repairs, or cannot keep your home warm efficiently, it is likely time for a replacement. First Class Heating & Air provides professional furnace replacement and installation in Greenville, SC, with a focus on proper sizing, safety, and long-term value.
We properly size every furnace using Manual J load calculations. An improperly sized furnace creates serious problems: an oversized unit will short-cycle, creating uncomfortable temperature swings, excessive noise, and premature wear on components. An undersized unit will run constantly without adequately heating your home, consuming excess energy while leaving you cold.
Modern high-efficiency gas furnaces achieve 96 to 98 percent AFUE (Annual Fuel Utilization Efficiency), meaning virtually all the fuel you pay for is converted to usable heat. If your current furnace has an AFUE rating of 80% (common in units installed before 2000), upgrading to a 96% AFUE model reduces your fuel consumption by 20 percent for the same amount of heat output.
Our furnace installation process is comprehensive. We remove and dispose of your old furnace, install the new unit with proper gas line connections and venting, verify all safety controls including the heat exchanger and flue, test the ignition system, calibrate the gas pressure to manufacturer specifications, inspect ductwork for leaks, and set up or upgrade your thermostat. We do not leave until your home is heating evenly and safely.
For Greenville homeowners considering an alternative to gas furnaces, heat pumps are an excellent option in our mild climate. They provide both heating and cooling from a single system and are significantly less expensive to operate than gas in many South Carolina utility rate structures. We can compare the long-term costs of both options for your specific home and energy rates.
Financing options with no surcharges make furnace replacement affordable. We offer flexible payment plans with quick approval so you can get the heat you need now without a large upfront expense. Many homeowners find that the energy savings from a new high-efficiency furnace help offset the monthly payment.
Signs You Need Heating Installation
Furnace Is 15-20+ Years Old
Furnaces have a typical lifespan of 15-20 years. If yours is in this range, it's using outdated technology and approaching the point where replacement is more cost-effective than repair.
Repair Costs Are Adding Up
If you've spent more than $500 on furnace repairs in the past year, that money is better invested toward a new, reliable system with warranty coverage.
Uneven Heating or Cold Spots
Rooms that won't heat properly, large temperature differences between floors, or cold drafts near registers indicate a failing or improperly sized system.
Rising Gas or Electric Bills
Older furnaces lose efficiency over time. If your winter energy bills keep climbing despite consistent thermostat settings, your system is working harder for less output.
Cracked Heat Exchanger
A cracked heat exchanger is a safety hazard that can leak carbon monoxide. This is one of the most serious reasons to replace a furnace, repairs are often not feasible.
What to Expect
Free In-Home Assessment
We evaluate your home's heating needs, inspect existing equipment and ductwork, and perform load calculations, all at no charge.
System Recommendation
Based on our assessment, we present options at different price points and explain the comfort and efficiency differences. No pressure.
Professional Installation
Our licensed technicians remove your old system and install the new one to manufacturer specs and code requirements.
Testing & Commissioning
We verify proper operation, test all safety controls, check airflow, and ensure even heating throughout your home.
Warranty & Support
We register your manufacturer warranty, provide maintenance guidance, and remain available for any questions or support you need.
What We Offer
What it costs
A new gas furnace is $3,800 to $10,000 installed, and a ducted heat pump is $5,000 to $12,000. A full system replacement is $8,000 to $15,000, and a 19 SEER2 variable-speed system typically lands in the high teens. The efficiency rating and the size of your home set the price. Estimates on replacements are free.
These are our own prices, not a national average. They are typical, not caps: size, efficiency tier, and access move the number. Your flat-rate quote comes before any work starts, and estimates on replacements are free.
See the full pricing guideNeed Furnace Replacement Service?
Free estimates · No pressure · Flat-rate pricing