Furnace Replacement in Des Moines, IA

When Replacement May Be Considered

The clearest triggers: a cracked heat exchanger (a safety issue, not a budget question), a furnace past roughly 15–20 years facing a major repair, repeated breakdowns across recent winters, or heating bills climbing as efficiency fades. Age alone does not force replacement, but age plus a four-figure repair estimate usually settles the debate.

Repair vs. Replacement

As with every repair-or-replace decision, it depends on system condition, repair scope, equipment age, efficiency, replacement cost, parts availability, and a professional assessment. The furnace version adds a safety dimension: combustion equipment deteriorates in ways that matter beyond dollars. The full framework is in furnace repair vs. furnace replacement.

Sizing a Furnace for an Iowa Winter

Furnace sizing should come from a load calculation, not the nameplate of the old unit. Many older Des Moines homes have furnaces sized by rule of thumb decades ago, and insulation and window upgrades since then may mean the right new furnace is smaller than the old one. An oversized furnace short cycles, creates temperature swings, and wears itself out; an undersized one runs flat-out on the coldest nights. Ask each bidding contractor to show the calculation behind their recommendation.

Efficiency: What AFUE Means

Furnace efficiency is measured in AFUE (Annual Fuel Utilization Efficiency): the share of fuel that becomes heat in your home rather than exhaust. An 80% AFUE furnace sends a fifth of its fuel up the vent; high-efficiency condensing furnaces reach the mid-to-high 90s. Higher efficiency costs more up front and changes installation requirements (condensing units vent through PVC and produce condensate that needs drainage). Whether the upgrade pays back depends on your gas rates, usage, and how long you will own the home. No one can honestly promise you a specific savings figure.

Installation Considerations

• Venting: switching to a condensing furnace usually means new PVC venting instead of the old metal flue.
• Gas line and shutoff: connections must be verified for the new unit.
• Ductwork: blower capacity and return sizing should match the new furnace; ask whether duct evaluation is included.
• Thermostat compatibility: two-stage and modulating furnaces need compatible controls to deliver their comfort benefits.
• Permits and inspection: ask whether the work requires a permit in Des Moines and who arranges it.

Choosing and Verifying a Contractor

Get at least two written quotes. Each should specify the equipment model, AFUE rating, what is included in the installation, the equipment warranty, and the contractor's own labor warranty. Then do the verification work this site repeats everywhere because it matters:

• Ask for proof of licensing and current insurance.
• Request a written diagnosis, scope of work, and price before authorizing work.
• Confirm the contractor's availability directly, since schedules vary.
• Ask what warranty the contractor offers on their own parts and labor.

The questions to ask an HVAC contractor article is built for exactly this conversation.

Frequently Asked Questions

Related: Furnace repair · HVAC replacement · AC replacement