What you are actually buying
A replacement quote is not just a furnace. It covers equipment, removal and disposal of the old system, plenum and duct transitions, venting, gas and electrical connections, condensate routing on high-efficiency units, thermostat configuration, permitting, commissioning and warranty registration.
When two quotes differ substantially, the gap is usually in that second list rather than in the box itself.
The main cost drivers
- Capacity determined by a load calculation for your home
- Efficiency level — mid-efficiency versus high-efficiency condensing equipment
- Staging — single-stage, two-stage or modulating
- Blower type — standard versus variable-speed
- Venting changes, especially when converting to PVC on a condensing furnace
- Condensate drain routing and freeze protection
- Duct and return modifications needed to reach rated airflow
- Electrical or gas line work
- Access difficulty — attics, crawl spaces and tight mechanical closets
- Permitting and inspection
- Thermostat upgrades and zoning
Efficiency: pay attention to the whole picture
Higher AFUE equipment converts more fuel into delivered heat, but the payback depends on your fuel costs, how much you run the system and how long you stay in the home. In a well-insulated home with modest heating load, the difference may take many years to recover. In a large, leaky home with a long heating season, it recovers faster.
Condensing equipment also requires PVC venting and condensate drainage, which can add installation cost depending on the existing setup. The furnace efficiency guide goes into detail.
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Comparing quotes fairly
- Confirm each quote is based on a load calculation, not the old unit's nameplate.
- Compare equipment by capacity, AFUE, staging and blower type, not just brand.
- Check whether duct or return modifications are included or excluded.
- Confirm venting and condensate work is specified.
- Confirm permitting is included and who pulls it.
- Ask whether commissioning measurements will be taken and documented.
- Compare labor warranty terms alongside the equipment warranty.
- Confirm removal, disposal and cleanup are included.
Rebates and incentives
Utility and manufacturer incentives for high-efficiency equipment change regularly and have specific eligibility requirements. Fort Collins Utilities publishes current residential program information at fcgov.com/utilities. Verify eligibility before counting an incentive toward your budget rather than after.
The cheapest quote is not always the lowest cost
An installation that skips the load calculation, reuses an undersized return and never measures temperature rise will cost less on paper and more over fifteen years in comfort complaints, higher bills and premature component failure. What installation quality includes is worth reading before you compare numbers.