Since we’ve been looking at air conditioning lately…
Watts = BTU / EER
Amps = Watts / Volts
Volts = Watts / Amps
The Voltage will normally be 230 if the Watts are higher than 1000 (generally units higher than 10000 BTU), otherwise 110. For amperage calculations, the rated value seems to use either 100 or 110 Volts for 110 Volt units and 225 Volts for 230 Volt units.
To calculate the cost of running, calculate the total kW h and multiply by the rate.
For example:
6 hours/day * 30 days * 950 Watts = 171,000 W h = 171 kW h
171 kW h * 0.10 $/kW h = $17.10
(BTU = British Thermal Units)
(EER = Energy Efficiency Ratio)
August 4, 2010 at 3:18 pm
What temperature do y’all usually have to set your thermostat in order to stay reasonably comfortable?
In Summer months ours rarely dips below 79 but during the Winter we usually leave it right at 65.
August 4, 2010 at 8:12 pm
In the winter, we have our thermostat on at 20.5 C during the day, and 16 C at night (which is 69 F and 61 F respectively). In the summer, we usually just turn the air conditioner on when it’s unbearable, and then it usually only cools down the lower level. Most of the cooling down comes at night when we open the windows (if the farmers aren’t spraying pesticide – we tend to have to wake up in the middle of the night and close the windows when that happens).
Right now it’s about 24 C inside and 26 C outside and upstairs is about 28 C (75 F, 79 F, and 82 F). 26 C is fine, as long as it’s not too humid. It’s hard to sleep upstairs when the temp is at 30 C and the humidity is making it feel like 40 C, though.
We don’t nearly run the air conditioner for 6 hours a day, or for 30 days in a month. Maybe once or twice a week if it’s a heat wave, and then maybe a couple or three hours.
August 4, 2010 at 8:57 pm
Take your comments on Summer/Winter and reverse them and it’s similar for East Texas. We keep the heat off until it’s just too cold for the little ones.
Earlier in our marriage we had to keep the AC set on 70 (21 C) during the Summer but over the years we’ve been gradually inching it upward and growing accustomed to it.
Right now, like I said, we seldom have to drop it below 79 (26 C) in order to stay comfortable, even during August where it’s about 95-100 F (35-40 C) each day with high humidity.
It’s funny how humans can accommodate such a variety of temperature.