What are my options for a third floor mini-split install?


What are my options for a third floor mini-split install?

Asked by Robert

I have electric baseboard heating in my 800sq ft. third floor that I would like to replace with a mini-split system. The house has recently had an energy audit complete with air sealing and insulation improvements. I do not want to put a hole in my wall nor do I wish to run mechanicals down 3 stories to the ground. What are my options for stand alone heating and cooling? Thanks!

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David Willson's picture


Mini-splits are an excellent solution for your needs but any mini-split system will require a hole through your wall.

The wall mounted, inside coil/fan unit must have pipes and wiring running outside through the wall to the condenser, which is usually on the ground below.

A mini-split system can be completely wall mounted, meaning the external condenser unit is mounted directly outside of the interior coil unit on the wall instead of on a pad on the ground but for a 3rd floor unit there is the problem of access.

  • 'The MiniSplit Shop' carries roof and wall mounting brackets for a condenser.
  • But the issue with a condenser wall mounted on a 3rd floor wall is the need for maintenance and your local building code in Cleveland may require access by someone standing on the ground.

So if you're considering a mini-split system for your 3rd floor, you need to be prepared for an external chase down the outside wall that houses the wiring and line set (two insulated copper pipes that carry the refrigerant).

  • That said, though, the chase can be made decorative to match other trim on your house or even a downspout.
  • We've even hidden a line set inside of a fake copper downspout on an historic house.

None of the other ideas - a small furnace in the attic, electric heat, or combined hydronic - can provide cooling to your 3rd floor, which is likely part of why you're considering a mini split system.

I suggest you work with an installer who is willing to make the outside chase blend in with the rest of your home.

Good Luck!

For more information:

Read "I can't afford geothermal. Is an air-to-air heat pump my best option for heating?" a Q&A answered by Randy Potter.