I have an an interior room in my house with no exterior walls. The central A/C for the house cools it just fine now. I am moving my in-home office with all my computer equipment (6 PC's, each with a monitor, UPS's and router's) that I've calculated generate 8800 BTU's, to that room.
Right now, my office is in another, larger room (300sqft) and it is on it's own zone of the house's central A/C with extra vents and it cools off just fine. I am trying to figure out the best and most economical way to cool the in-home office in the new room. I am considering 2 choices: 1. is to have an HVAC company re-route the extra vents to the smaller room. 2. is to buy a portable A/C unit and vent it to the attic. I live in NC so there can be considerable heat here. Our utility rate is 9.6c/KW. So, on a monthly basis, how much would it cost to cool the computers with a Portable A/C unit? How much would it (does it) cost to cool the computers with the central A/C?
Have a Pro come to your house if you haven't yet. Most times you can't just run extra vents. B/c if your unit was sized properly it won't be able to handle another 8800BTUS thats over a half-ton.
Your equipment generates 8800 and each person in the room will also generate 600 b.T.U's so your at 9400 btu you will need at least 1 ton of a/c you haven't mention the size of your central air and the size of your home to be able to tell you if you can add just vents to the room, there is also another way to go use ductless system split unit, hope this helps you out good luck
Here is some thing even i learned just recently for every 3141 watts add a ton of a/c to cool down that room, hope this helps
Do you have Radiant Guard in your attic? Before I did all this mumbo jumbo in the other answers I would look at getting radiant guard installed in my attic & reduce the temperature of the attic & the need for A/C to begin with. People use this product with success in Texas & Texas gets a whole lot hotter than NC. It has reduced my A/C requirements by 1/3 in the summer
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