HVAC Inspection: What We Find in Minnesota Homes

Replacing a Minnesota HVAC system is one of the largest single-line repair costs a homeowner can face. The HVAC portion of a home inspection isn't a substitute for a tune-up — it's a fast triage to flag systems with major issues or that are at end-of-life.

What we check

• Furnace — Age, manufacturer, model, BTU rating, heat exchanger condition (visible portions), flame pattern, gas valve operation, venting condition
• AC condenser — Age, model, operation, refrigerant line set, electrical disconnect, clearances, fin and coil condition
• Ductwork — Visible portions, supply/return balance, insulation, sealing, asbestos wrap (older homes)
• Filter location and condition
• Thermostat operation
• Condensate drainage (high-efficiency units)
• Venting for combustion safety

Common findings in southeast MN

• Aging furnaces (15+ years). Average residential furnace life: 15-20 years. Past 15 years, plan for replacement budgeting.
• Single-stage AC near end of life. Average condenser life: 12-15 years.
• Undersized return ducts. Causes high static pressure, premature blower failure.
• Improper combustion air supply. Common in basement-installed furnaces.
• Cracked heat exchangers — Carbon monoxide risk; immediate replacement needed.
• R-22 refrigerant ACs — R-22 is no longer manufactured; repair costs spiral.
• Frozen evaporator coils — Indicates low refrigerant or airflow issues.
• Missing condensate trap on high-efficiency units

Replacement cost expectations (2026 SE MN)

• Standard 80% efficient furnace: contact an HVAC contractor for current installed pricing
• 96% efficient modulating furnace: contact an HVAC contractor for current installed pricing
• 2-ton AC condenser + coil: contact an HVAC contractor for current installed pricing
• Heat pump conversion: contact an HVAC contractor for current installed pricing
• Full system replacement: contact an HVAC contractor for current installed pricing

What we don't do (and why you should still get a tune-up)

A home inspector's HVAC check is a pass/fail snapshot — not a tune-up, combustion analysis, or refrigerant-charge measurement. After closing, schedule an HVAC contractor for a full service. More about our HVAC inspection scope.