Foretravel Owners' Forum For owners and Fans of Foretravel Motorcoaches September 13, 2025 ...

Re: Advice on replacing both rooftop ACs with heat pumps

Reply #75 – August 04, 2018, 11:46:24 pm

Last I heard it was more economical to run a vehicles a/c then with the windows open pretty broad stupity statement. Location, location, location. 30 hz - 35 hz  of design at 60 hz are typically tuned out of rotating equipmentt running on variable frequency drives due to destructive resonate forces. Beyond my expertise.

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Re: Advice on replacing both rooftop ACs with heat pumps

Reply #76 – August 06, 2018, 08:47:23 am

BTUs ARE DIFFERENT!!!  DARN!!!

Oh, what can I say, I was comparing apples with oranges, sort of. The old Penguin unit was 13,500 BTU. The new Brisk II is 15,000 BTU, an 11% increase. So, nevermind the dB noise readings. By actually reading the specs, I could have saved (in my SWAG estimate):

- Money: about $600
- Weight: about 20lb
- Noise: about 5db
- Short-cycling of the compressor: bad
- Embarassment in a public forum

Live and learn.

On the plus side:

1. With global warming, if outside temperature ever reaches 120 degrees, this U270 will handle it.
2. The dB readings are impressive: it's about 5db quieter with 11% more BTUs.
3. One AC can cool the rig most of the time. So the short-cycling issue is mitigated. I will manually manage this by turning off the front and rear units based on their run time.
 

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