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Old 05-11-2012, 08:23 PM   #16
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To Zone or Not to Zone? Need Your Opinion!


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Originally Posted by DCTepper View Post
Sorry, I should have mentioned that there are currently NO runs in the basement, only the preliminary batting insulation on the walls. I agree, the 6F difference will become closer to 3-4F at most once the ducts are run and the R13 is installed against the exterior walls.

As far as the mini system, I am not concerned with cooling as much as I am heating in the winter.

And the plot thickens...

So was or was not the basement included in the original heat load analysis? If not than you may find your current 60k btu system will struggle a bit conditioning the entire structure.

Those mini splits come in heat pumps as well meaning both heating and cooling all by way of self contained (paid for only once!) refrigerant so you will not be paying for gas or electric (beyond the normal condenser/heat pump and blower being on).

Just something to think about.

I understand what youre' saying BT and it makes sense, but still wondering what the original heat load entailed.

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Old 05-11-2012, 09:09 PM   #17
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To Zone or Not to Zone? Need Your Opinion!


We pretty much live in our lower level. It's 1400 sq. ft. and it is always cooler there than in the main level.. Large living room, laundry room, bedroom, bathroom and library. Because of power failure due to ice storms I installed a generator and a small 24,000 btu fireplace, ventless. The room in the winter can get as low as 63-64 degrees before the fireplace. Now in 30 minutes it is 72 + to any temperature we want. Ceiling fans circulate the heat, and in 1-2 hours the heat travels up the stairway and the main level furnace gets a break....sometimes for 3-4 hours. I'm all for supplemental heat and cool, but I didn't want the eyesore of another condensing unit for a split system. (yes I said eyesore)
Supplemental heat can be in any form, baseboard heat, radiant heat, even portable heaters. I'd leave the original heater alone, assuming it is in good condition and add something for the lower level....will you need cooling there?
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Old 05-12-2012, 02:27 AM   #18
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To Zone or Not to Zone? Need Your Opinion!


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Originally Posted by Doc Holliday View Post
And the plot thickens...

So was or was not the basement included in the original heat load analysis? If not than you may find your current 60k btu system will struggle a bit conditioning the entire structure.

Those mini splits come in heat pumps as well meaning both heating and cooling all by way of self contained (paid for only once!) refrigerant so you will not be paying for gas or electric (beyond the normal condenser/heat pump and blower being on).

Just something to think about.

I understand what youre' saying BT and it makes sense, but still wondering what the original heat load entailed.
I see your concern, Doc, but most heat loss calcs have a bit of fluff in them plus design day doesn't usually last very long. With the added insulation, he should be ok, imo.

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