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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.