What size air conditioner for 2800 square feet?

Answer 1

Most Air Conditioning Suppliers on the internet have a different method of estimating air conditioner size requirements. At the end of the day it's going to be an estimate at best.

Assuming a 3 Metre Ceiling, that makes 260 x 3 = cubic metres 780 cubic metres.

If there was no heat gain at all then you'd probably go for about 300 BTU per cubic metre if it has south facing windows, or 200 per cubic metre if not. So this room would be starting at 234,000 BTU for south facing windows, or 156,000 BTU if there are none.

For heat gain, they say add 400 BTU for each person or heat generating piece of equipment too.

All in all, it's a pretty huge area to air condition, the expense and power requirements are going to be massive. If it's a house then it's probably sensible to just air condition the rooms which need air conditioning with seperate portables or fixed installs. If it's a big commercial or industrial area then evaporative cooling or fans might be a more realistic proposition.

Answer 2

3.5 ton