air conditioning

I have a bedroom air conditioning unit which drains water to the bath waste pipe via a tundish valve (this was my idea - not the A/C installers as I didn't want them to run a huge white pipe down the front of my house). It works perfectly for the purposes of the A/C to drain condensate but...

I am in the middle of an extension and full refurb and want to fit Air Conditioning for 3 bedrooms on 1st floor. A couple of quotes recommended a single 9KW outdoor unit to run three indoor units for the three bedrooms. The cost was between £4.5k and £7k The outdoor unit will be fitted on rear...