Archived Discussion Topic

Air con       started by kendalg on 29 Dec 2011   (23923)
Message InfoMessage
From kendalg

29 Dec 2011 12:32 AM
Being new to this type of heat can you recommend what type of air con to install in my new build. I've been told that evaporative doesn't work in humid conditions but just how humid does it get in Perth? We have split air reverse cycle in the rental which only cools down the room it's in. In your opinion what is best for Perth weather. Thanks Kendal
From moirclan

To kendalg

29 Dec 2011 3:23 AM
reverse cycle normally heats as well ??? i have evap put it in years ago but it rarely works well with the humidity we have now, it didnt seem so humid years ago , i also have split systems reverse cycle which i use for cooling and heating when i need it, i also have big industrial fans in the living room which are good and cost efficient
From kendalg

To moirclan

29 Dec 2011 10:47 AM
Thanks for that. Where did you get the industrial fans from? They sound good. K
From Aussiemove

To kendalg

29 Dec 2011 5:12 PM
Generally, Perth's summer climate is hot and dry, so you see lots of evaporative aircon units around, especially in older houses. But on hot, humid days, they don't work very well at all. We do seem to be getting more humid days than a few years ago, but still nothing like Queensland, for example. Evap systems only cool, they do not heat. Split-systems work on the refrigerative principle and so they work well in all conditions (dry or humnid) plus they can heat as well as cool. But, as you said, they only work in the room in which they are installed. On the plus side, they are very configurable. ie. if you had one in every main living area and one in every bedroom, you could set each one exactly as you want it. But you do end up with lots of metal boxes (the compressors) attached to the outside of your house. Possibly the best option is a ducted refrigerative system, where there is one compressor situated outside the house, which does the cooling bit, some kind of fan in the roof space and ducting throughout the roof, with outlets in the ceiling of each room. The best systems allow several areas to be controlled independently. There's another variation for buildings where the roof does not allow ducting - this is a multi-outlet split system. This has one outdoor compressor and several wall-mounted (or sometimes ceiling mounted) indoor units. regards, Geoff
From kendalg

To Aussiemove

29 Dec 2011 7:43 PM
Thank you so much Geoff.
From kendalg

To Aussiemove

14 Jan 2012 12:00 AM
Just a quick question in relation to air con again. I don't know what system you have yourself but in general if you cool a room then turn the air con off, should the room at least stay cool for a little while if all windows and doors are kept shut (not using evaporative obviously). Thanks
From jimboman

To kendalg

14 Jan 2012 2:22 AM
Air Con cools the air but air cools and heats rapidly. If the fabric of your home (walls, roof, roof space etc.) become hot, then that will act like a storage heater and warm the air again. This is quite common. Your house may feel cool in the mornings but that is because the brickwork is cool and that removes ambient heat. Later in the day, the brickwork heats up and releases warmth into the air in the house. You need to insulate your walls and ceiling and maybe tint your windows. Also, install a whirly bird in your roof (a wind driven venting cowl that will extract hot air from your roofspace).
From kendalg

To jimboman

14 Jan 2012 11:19 AM
Thanks that's really helpful and no air con specialist mentioned anything about how the house is insulated. We are in a cheap rental at the mo so doubt if there is much in the way of insulation. Definitely something to think about for our new build. Kendal