We have a hard freeze (low teens) coming tonight. The heat pump was a little low on freon, and I was worried about the houseboat/plumbing freezing. I came up here and topped it off with freon, and found what I believe is the small leak that's been bugging me.
When I unbolted the battery box and moved it, I discovered one of the ports to be lightly oily. I tightened the Schrader valve and checked it with liquid detergent, and no bubbles!
This is a 38 seer (!!!) Mini-split and is efficient down to 0°F! It's been running 2 years, and I love it!
