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There is a high efficiency window unit made by LG that uses variable speed conpressors and expansion valve.
What I would do when I was using window units is I would take my old ones, sell them before they die and buy a new one every 2 or 3 years. Sell the old one so I wouldn't have to eat the entire cost of a new unit.
Now I use high efficiency split units.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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