My friend bought a new house last year. He is doing the house up and redecorating it and wants air con installing (wall mounted units) here are the sizes etc.

The house is well insulated with Cavity Wall and lots of loft insulation. I said I would find out what he would need before he calls a company out so he has an idea of what he is looking at. I've used lots of calculators with differing results - ive put down below what the results are that I have got from websites.


Room sizes are as follows in meters.
Lounge
4.26(l) x 4.26(w) x 2.64(h)
Usual TV and sofa arrangement with seating for 4 people – 6 at a push. Usually only 2-3 people sat in here. This room is separated by the kitchen by a door. Off of the lounge is a small hallway with stairs to the landing. The window in this room faces South East. Gets the sun first thing in the morning which is gone by midday. Was thinking a 7000 btu unit?


Kitchen,
5.18(l) x 3.35(w) x 2.74(h)
Has a dining table that can seat 4 people and a breakfast bar that seats 2 people, usually 2 people through the week though. Gas hob with 5 rings along with a fan oven. Cooking is usually on weekends where we have all the hob fired up and oven. The kitchen is an entrance to the house from the garden and if having BBQ's or entertaining the kitchen external PVC door is left open. Kitchen window and door faces North West. Gets the sun from about 2pm until sunset if were lucky to have summer. - maybe a 3.5kw unit)


Main bedroom
4.26(l) x 4.26(w) x 2.64(h)
Faces South East, sun shines in on a morning. - possibly a 7000btu unit?


Second bedroom, Currently has a 7000btu unit (2.1kw)
3.35(l) x 3.35(w) x 2.64(h)
Smallest room in the house, this faces North West. - possibly a 5000btu unit?