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Need Opinions from HVAC guys on a One Room AC/Heat

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Need Opinions from HVAC guys on a One Room AC/Heat

Old 07-11-2013, 01:14 PM
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Default Need Opinions from HVAC guys on a One Room AC/Heat

Thought I would look to my THT friends form some opinions regarding one of these one room split Heat Pumps. Looked at the LG and the Mitsubishi. Both seem very similar in features and pricing. I am in the need of a unit from my Garage. its 25'x30' 750 SF. It is insulated and has insulated doors. Trying to turn it into a man cave. I was thinking 18000 BTUs would work? Any advice or thoughts would be appreciated.
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Old 07-11-2013, 01:21 PM
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Originally Posted by Chet88 View Post
Thought I would look to my THT friends form some opinions regarding one of these one room split Heat Pumps. Looked at the LG and the Mitsubishi. Both seem very similar in features and pricing. I am in the need of a unit from my Garage. its 25'x30' 750 SF. It is insulated and has insulated doors. Trying to turn it into a man cave. I was thinking 18000 BTUs would work? Any advice or thoughts would be appreciated.
That's 1.5 tons and should be fine even in Florida.
The concrete slab is a plus.
The garage doors, even with "insulation" is a minus.
If its an attached garage thats a plus (less exterior wall surface).
How much ceiling insulation does it have?

What size circuit does it require?
I recommend a dedicated circuit for this.
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Old 07-11-2013, 01:29 PM
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I have a Sunroom in FL. Probably 25x10 or so. NO insulation in walls or ceiling. Lots of single pane windows. I bought a new Window Unit at Home Depot. Even in July/August, you could hang meat in there it does such a good job. $450. Just a thought.........
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Old 07-11-2013, 01:56 PM
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I recently had a 4 wall unit/3 compressor Mitsubishi installed in my 1959 3/2 - vaulted beam roof with no insulation, thick poured concrete walls - replaced 4 window units that did a poor job of cooling.

This Mitsubishi is fantastic - dropped my electric bill by 40%, keeps the house too cold if set at less than 78. Can't really speak how the heat side works, only used it once.
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Old 07-11-2013, 02:13 PM
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A 18000 btu system will work but there is not much difference in price to go with the 24000. The garage doors are going to have a lot of infiltration load.
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Old 07-11-2013, 06:40 PM
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Thanks fellas. Anyone have experience with the LG unit?
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Old 07-11-2013, 07:57 PM
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The LG is a good unit. We use to install them. We now use Trane or Mitsubishi. The reason for the switch was the customer service from the manufacture to the dealer was not the best. We had a customer lose their remote in a rental cabana house. It took us almost two months to get a replacement and needless to say my customer was none too happy.
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Old 07-11-2013, 08:18 PM
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This?

https://www.goductless.com/Trane/4MX...-Pump/30842.ac
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Old 07-11-2013, 08:31 PM
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I built a 24X32 garage/shop with a 24X24 2nd floor office/mancave. The building had 2 9'X10' insulated garage doors, 2 36" entry doors, 6 windows downstairs and 12' ceilings. The upstairs had 5 windows, 2 4' sky lights with vaulted ceilings. The whole building was cooled by 2 tons (24,000 btu).

So I'd say 18,000 btu's would be fine. What it won't do is cool it if those doors get opened on a hot day or you turn off the AC and let the space get humid and hot because you're not using it. When not in use, I wouldn't set it higher than 80 degrees.
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