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Question on Mr. Slim Split-Ductless Heat Pump

Posted by brenda_md (My Page) on
Thu, Oct 23, 08 at 11:00

We are replacing our current patio and arbor with approximately a 375 sq. ft. four-season room. Originally, it was not our plan to bother with A/C as the room will have ample windows to open and ceiling fans (the room is on the North side of our house). However, we know it will be used a lot and there probably will be times when A/C would be appreciated on some of our hot, muggy mid-Maryland summer days.

Our current heat pump will not be large enough to tap into. The Mr. Slim heat pump was recommended as a cooling option for this room and it would also provide heating for cold days. Previously we were considering electric baseboard as the heat source. Regardless, our plan is to have a small gas fireplace for heat in the coldest months to take the chill off quickly and for ambiance. The Mr. Slim heat pump will be more reasonable for cost efficiency compared to electric baseboard heat as we will always want some low level residual heat in this room when not in use.

Since the Mr. Slim inside unit is recommended to be on the wall or ceiling, my question is how much warmth is radiated onto the flooring? Our flooring will be a cement slab with tile over top. I am sure the electric baseboard would have been great at radiating heat to the flooring in the cold months, but again, it would also be more expensive. By the way, with this room on the North side of our house, there will be no direct sunlight into the room in the winter months. For those of you with experience with the Mr. Slim heat pump, I would like to hear about your experiences. Thanks.


Follow-Up Postings:

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RE: Question on Mr. Slim Split-Ductless Heat Pump

Having had a Mit HP ductless in my vacation home, I have a few comments to share. The unit has its drawbacks such as air noise, certainly less than a thru the wall or window unit but more than a piped in diffuser from a central system. I found it to be a bit annoying but grew used to it.

The other drawback was the constant air movement that some would perceive as a draft. With the air moving a properly sized unit should distribute the heat fairly well as the wall units discharge down and have an air sweep option.

No doubt the elect baseboard will be the quietist more and comfortable for heating; however it comes at a cost (energy use over a HP)

Another option if you are going to heat electrically is to consider electric radiant heat mats installed under the tile. This will keep the floors warm, at or below the cost of operating the baseboard but add 10X the comfort and would be supplemented with the fireplace.

For AC you could still go with a ductless or quality through the wall unit.

Here is a link that might be useful: one type of electric floor radiant


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RE: Question on Mr. Slim Split-Ductless Heat Pump

Electric radiant heat was actually one of our first considerations, especially before we thought there was a need for A/C. In talking with our architect and contractor, it was not considered cost effective which is why we next looked at electric baseboard. Now with our desire to keep some minor heating in the room when not in use, we are concerned about the energy efficiency of either electric method. There is no doubt radiant would feel wonderful to walk on which is why we first thought about it.

Regarding your mention of the air noise in your vacation home, do you think that was due to the size of the space you were heating with the Mit HP? Since the unit will only be heating one room for us, perhaps the air noise would be less than when the unit(s) are needed for a house?


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RE: Question on Mr. Slim Split-Ductless Heat Pump

I had a 18,000 BTU HP in a 450 sq ft florida room with lots of windows.

It would be like running a common bath 120 cfm fan is the best way for me to compare to for noise level.


 
 

 

 


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