by nhowarth » Tue Jun 20, 2006 3:39 pm
Hi littlemiss,
I've got a 220 sq.m concrete & brick bungalow and have both air conditioning and underfloor central heating - using hot water heated by an LPG burning boiler.
Last winter I spent about CYP 160 on LPG - we have a 400 litre storage tank.
Because our rooms are quite large, we don't need the air conditioners on during the day - ceiling fans in the lounge area are enough to keep us comfortable. At night we have the bedroom a/c on for an hour or so before we go to bed and then have it timed to run for three hours.
Regarding insulation, we have a pitched wooden roof over a reinforced concrete ceiling. This provides good insulation, it stops the house heating up like an oven in summer and helps retain the heat in the winter. I suggest you avoid having a concrete roof. It will act like a storage radiator in the summer and you can imagine how hot the concrete gets with the Mediterannean sun beating down on it all day and in the winter it lets all the heat escape and increases your fuel bills. (These days you only find concrete roofs being used in low-cost housing).
Also in the floor we have a layer of aerated concrete and layers of a polystyrene-like insulation material supplied with the underfloor heating.
Our external walls are built using 25cm bricks rather than the more normal 20cm - this too improves insulation.
You can also build with cavity walls or 'Ytong' blocks (although I was advised by our architect that these do not withstand earth tremors as well as the local brick) or you can line the walls with plasterboard over an insulating layer of rockwool.
Regarding your '3 phases' question. This is actually 3 supplies running to your house - and you have a 'special' electricity meter that shows 3 separate electricity consumption readings. What your electrician will do is balance the total electricity supply demand of your house across the three supplies. This stops circuits tripping out, lights flickering, etc when the load on a single supply would exceed its capacity. When you get your electricity bill, it will have 3 meter readings on it. Unless your house is very small or is very cheaply built, it will have three phases (and you will have four electricity cables running to the property rather than two).
Other things you can do to improve insulation is to fit tinted double-glazed window and patio door units and window shutters to stop the sun flooding in (and the heat flooding out).
Regards,