Basement A/C ducting

luvrbus · January 30, 2016, 02:53:51 PM

My doctor's new Marathon has 4-15,000 BTU AC/Heat pumps this the first time he ever owned a Prevost with roof tops and he loves them

Scott & Heather · January 31, 2016, 06:39:49 AM

Hey George, the new heat pumps today are rated as low as -10 degrees F give or take.

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Geom · January 31, 2016, 04:29:37 PM

Quote from: Scott Bennett on January 31, 2016, 06:39:49 AM
Hey George, the new heat pumps today are rated as low as -10 degrees F give or take.

Interesting, I didn't know they had them working that efficiently now. I remember the one we had at the house sucked butt and would freeze solid at about ~20-25 degrees and had to run a regular defrost cycle (by reversing flow, i.e. taking heat out of the house).
Once it finally flamed out, I replaced it with a higher efficiency normal AC and no heat pump, and never looked back.
The house felt warmer and my (overall) bills went down

If you think about how they really work (basically an AC in reverse) I really don't see how they can get them to work down that low. Seeing as how it's "pumping heat" there's not a lot of residual heat in -10 degrees to pump, lol.
So they must be compressing the crikey out of that refrigerant.

Scott & Heather · February 01, 2016, 12:18:35 AM

Lol. I can't say for sure, but check this out:
http://www.mitsubishicomfort.com/press/press-releases/industry-leading-hyper-heating-inverterr-mxz-outdoor-unit-is-first-cold-climate-heat-pump-for-multiple-zones-0

100% heating capacity down to 5F and guaranteed operation down to -13F. Crazy but the research I've found shows that they work. I seriously want to put a unit in our bus if I can find one with enough BTU output that is still 120v.

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luvrbus · February 01, 2016, 12:50:46 AM

It is the Freon of today the 410 is a high pressure Freon unlike the older Freon's it is around 400 psi operating.At -13 I would want a backup system

TomC · February 01, 2016, 04:04:03 AM

Mini splits sound good on paper. But most units are not made for mobile use. Meaning the freon lines and coils are not reinforced as they are on either a basement or roof top. The A/C companies even make rough neck versions for use on big rig sleepers. I prefer the simplest equipment possible. Roof top airs, propane furnace, electric water heater, additional heat with resistant heaters. Good Luck, TomC

TedCalvert · February 04, 2016, 02:01:47 AM

You could have it both ways, a/c on top & heat below. Van Hool uses baseboard hot water heat; you could use electric if you didn't like Webasto; and their a/c is one big rooftop unit. Probably expensive to fix.