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Why You Should Replace Your AC and Furnace Together (Michigan, 2026)

Thinking of replacing just your furnace or just your AC? You may want to think again: In Michigan, replacing your furnace and AC together offers better long-term value by maximizing efficiency gains.

A new outdoor AC condenser is engineered to work with a specific matched indoor coil. Pairing a new condenser with an old coil not only reduces efficiency, it reduces capacity and voids most warranties, which is why HVAC Comfort installs furnaces and ACs together as a matched HVAC system on most Michigan replacements.

Quick answer

  • Why match? New condensers are engineered to pair with a specific indoor coil
  • Mismatch consequences: Lost efficiency, lost capacity, voided warranty
  • Brands HVAC Comfort installs: Trane, Coleman
  • Full system install time: One day, 8 a.m. to 6 p.m.

Our Take on Replacing Just Your Outdoor AC Unit in Michigan

For Michigan homeowners, replacing just the outdoor AC unit may seem like a cost-saving solution, especially when the indoor equipment is still running. However, modern air conditioners are designed as matched systems, which is why we recommend replacing both components rather than creating a mismatched installation:

The biggest mistake we see is people replacing just the outside unit and keeping a 15-year-old coil inside. The new condenser is engineered to work with a specific indoor coil. Mix them and you lose efficiency, you lose capacity, and you void most of the warranty.

– Gregory Matson, Owner, HVAC Comfort

Brands and Warranties

HVAC Comfort installs Trane and Coleman. Each has a different warranty profile:

  • Trane: 10-year parts, 3-year labor
  • Coleman: 10-year parts, 10-year labor

Install Time

A full furnace + AC + coil replacement in Michigan is one working day, 8 a.m. to 6 p.m.

Why HVAC Comfort Installs Matched HVAC Systems in Clarkston, Michigan

HVAC Comfort installs matched Trane and Coleman systems across Clarkston, Michigan.

Frequently Asked Questions

What happens if I only replace the outdoor AC unit?

You lose the efficiency and capacity the new condenser was rated for, and you may void the warranty.

How long does a full system install take?

One full day, 8 a.m. to 6 p.m.

Which brand has the better labor warranty, Trane or Coleman?

Coleman, 10 years parts plus 10 years labor.