Forget about heat tape. VERY DANGEROUS STUFF.
Increase the size of the condensate drain pipe. 2-inch minimum.
Finally, I'd NEVER
EVER put a heating / cooling unit in an unconditioned space.
For a HOST of reasons.... the first being it doesn't even make sense to have a furnace out on a patio in the winter....
That's basically what you have....
If you're building a new home, don't let the architect or builder convince you to put your furnace or AC unit up in an attic or other unconditioned space.
I don't care WHAT THEY SAY. It's a
mistake.
Create some small utility room on the main floor and put it in there.
You'll NEVER EVER regret making this decision to keep the unit out of an area where the temperature extremes work AGAINST what you're trying to
accomplish inside your home.
Think about it. Why would you want your furnace and ductwork to be surrounded by air that's minus 20 F?. Why would you want the AC unit to be working away up in an attic space where the air temperature is a blistering 150 F?
It's INSANE....
What's more, it's easier for a service man to work on the unit if it's in a room where he has easy access to the equipment.
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