|you know what an air-conditioner looks like.....|
Our house at Eight Acres came with an older style ducted reverse cycle split system air conditioner installed in the lounge. On very hot days, we would turn it on and lie on the couch to try to cool down, but the cold air never quite made it to the bedroom at the other end of the house. On the first day of the heat waves we had in December 2013, the air conditioner stopped working. Although Pete tried his best to fix it, he admitted defeat and set up an old “window rattler” system that we had used in the previous house. It was loud, but effective, so we lived with it for nearly a year.
Late last year, we decided to install a new air conditioner in our bedroom. I was still not totally comfortable with the idea of using air conditioning, but I told myself that this is a house that we intend to sell, so we won’t be using it forever. Since it has been installed (and Pete got the lounge one fixed at the same time), and we still had all three air conditioners set-up, we used our energy meter to get an idea of their energy use. I was very surprised to see that the new air conditioner used far less energy (it worked out to be about 10c/hr, compared to 50c/hr for the lounge one and $1/hr for the window one, the lounge one is about twice the size, but uses 5 times the electricity). Apparently this is because the new system includes an inverter, which better matches the machine's energy consumption to the activity in the room. It is good to know that at least the technology is improving.
I recently read an article in Grass Roots that said new houses, even the ones with good energy star ratings, are really just insulated boxes designed to keep hot air in (winter) or cold air in (summer), but not really designed to take advantage of passive solar opportunities. And this makes sense from my own observations. This made me feel a little better about using air conditioning. Our house is pretty cheaply built, but it is insulated and well-sealed, it was designed to be air conditioned, and not naturally cooled. When we run the air conditioner we do our best to keep the cold air in the room, using an old mattress protector as a second curtain, and keeping the door closed.
|.... so here's two hot dogs instead.|
At our house at Cheslyn Rise we made a huge effort to set up the house to be naturally cool. Firstly we orientated the house to have verandas facing north and most of the windows facing south. We are lucky to have great air flow, with plenty of windows, breeze ways, high ceilings, fans and a windy hill-top position. Finally we tried to prevent heat entering the house by choosing a light roof colour and insulating the ceiling cavity (curtains will help further when I get around to sewing them). So far we have found this house to be perfectly comfortable on even the hottest days. We are going to try to avoid installing air conditioning if the inside temperature remains cool enough.
- Improve curtains and sealing of rooms to be air conditioned
- Keep doors closed and only cool small areas at a time
- Install shading (trees or awnings) outside the windows to reduce heat coming into the house
- Improve insulation in ceiling and walls
- Install ceiling fans to improve circulation of air
- Change roof colour to as light as possible (can be painted if roof is in good condition)
- Add ceiling space ventilation to remove hot air
- Move windows and doors around to improve airflow or change how rooms are used to make use of cooler rooms for sleeping