I'm redoing all the electrical in my entire house, and I was running some numbers just for fun on the energy efficiency gains by just having LED, vs incandescent bulbs. I know the basic LEDs use much less power for the same number of lumens, but I noticed that almost no one takes in to account the lower cooling costs. So I ran some quick numbers and wanted to make sure my math was correct.
I'm in a hot climate so that's why I'm interested in the numbers for cooling.
Say my baseline is 1000 watts of incandescent. I move to LED lighting and we'll say the LED lighting uses only 15% of the energy for the same lumens. So now I'm at 150 watts. So I saved 850 watts of heat, and from reading online comes out to ~3.4 BTUs/watt, so I should have saved ~2,890 BTUs which is close to a 1/4 of a ton of cooling capacity that I saved. Assuming I have a SEER 16 AC I saved roughly another ~180 watts in cooling as well.
So it would appear that the total energy savings would be roughly
I realize the actual energy usage has many more variables, but I just wanted to make sure that my calculations for cooling energy requirements were generally correct, and that I wasn't missing anything major.