What size ac? what size btu do i need for a 12 x 18 bedroom?

what size btu do i need for a 12 x 18 bedroom?
Grants for watery proof, cavity e.t.c Need to...
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http://store.portableairshop.com/portabl...

it calculate how big a unit you need
In winter, does the plastic picture hermetically sealed...
As a rule of thumb, 400 square foot (37 m^2) can be cooled per 12,000 BTU/h (3.5 kW or one ton of air conditioning) by a refrigerative air conditioner. However, other factor will affect the total heat load.
You are discussion about 216 sq ft so 6000 - 7000 BTU should be fine. HVAC Tech. You could be very comfortable near an 8500BTU unit. Anything up to a 13,500 BTU unit will run on 120v outlet. Check your glass size and ask your dealer what he has that will fit surrounded by your opening.Buy accordingly.