Air con unit question

[thomp1983]

Hi all,

I feel I'm bout to ask a question that may be a bit silly re. air con units.

I'm looking into getting a split unit system installed to cool 2 bedrooms.

In my daughters bedroom there's only 2 choices for mounting the internal unit as we live in a chalet bungalow so 2 of the walls are sloped ceilings.

Ideally I'd want it tight it the ceiling above the wardrobe doors in the above picture.

Looking at the manufacturers instructions it recommends a 200mm clearance above the unit so air can filter in through the panel below.

Now for what feels like a silly question, does the ac unit have to draw air in from the room it's mounted in? I'm thinking I could cut the plasterboard away above the ceiling allowing the vent to receive air from the loft area above and then it would still pump the cooled air out into the bedroom.

If the unit can't be mounted like described above then the only other alternative that would work is to make a triangular frame mounted on the sloped wall to allow me to mount the unit correctly which from side on would look a bit odd.

Thanks,
Chris.

 

[Old Salt]

Air con works more efficiently if its circulating colder air so drawing from the room and gradually decreasing the ambient temperature. The problem in drawing it from the loft is that you would be permanently cooling the hotter air from the loft thus making the unit work harder.

Perhaps you could box the unit in above the wardrobe and taking in some of the loft space to give you the room and clearance required.

 

[thomp1983]

That makes sense on reflection, cars do the same as they switch the air recirculation to the interior of the vehicle when put on max so it's constantly cooling and conditioning the same air

 

[Mottie]

That makes sense on reflection, cars do the same as they switch the air recirculation to the interior of the vehicle when put on max so it's constantly cooling and conditioning the same air

They don’t. They only recirculate if you choose to. Recirculated air in a car would make the windows mist up.

 

[thomp1983]

Ok not all cars but my 5 series certainly switches the air to recirculation when the ac max button is used

 

[davelx]

They don’t. They only recirculate if you choose to. Recirculated air in a car would make the windows mist up.

Not if the aircon is running, it condenses out and drains away. Aircon will DEmist the windows in a car, that's one of its major benefits

 

[Mottie]

Not if the aircon is running, it condenses out and drains away. Aircon will DEmist the windows in a car, that's one of its major benefits

Sorry, but you are wrong. Fresh air will be dried, recirculated won’t and it will eventually mist up your windows.

 

[Mottie]

Ok not all cars but my 5 series certainly switches the air to recirculation when the ac max button is used

Yes but recirc is only meant to be temporary, for a quick cool down or to stop fumes from outside entering the cabin, not permanently on otherwise there wouldn’t be any point in the fresh air option. My car automatically switches to recirc when I use the windscreen washers or entering a tunnel. It switches back to fresh after that.

 

[thomp1983]

Any further help that's on topic?

 

[Rodders53]

Different type of indoor unit... Ceiling mounted.... like you see in shops and offices.
Floor /low wall- mounted types exist, too.

Or get in loft exchange unit(s) and lots of room outlets connected by pipes...

There may even be 'on ceiling' units that draw in from the back and blow out from the front.

Talk to your F-gas installer for the options and study the brochures from Daikin, Misubishi (Electric and Heavy Industries) etc.,.