[/quote]Agreed.
And so does the EIA (from 2009):
EIA said:
Average site electricity consumption in California homes is among the lowest in the nation, as the mild climate in much of the state leads to less reliance on electricity for air conditioning and heating.
Note that over 40% of CA homes have
NO cooling equipment versus the national average which is lower than 20%. Also note that about 14% of CA home have
NO heating equipment versus the national average of about 3%.
Heating a home with electricity in a cold climate
takes much more electricity than cooling the same home in a warm climate since the temperature differential is much higher (sorry image is so large):
And heating water with electricity takes a LOT of electricity: The label on a traditional resistive 50-gallon water heater reads around 4800 kWh/year while a 50-gallon heat-pump water heater reads about 1800 kWh/year (and provides room cooling, as well).[/quote]
The graph says it all. Thanks for the link. Very informative.
We've had lower costs with a heat pump (HSPF 9, SEER 13) versus natural gas furnace and A/C unit over the last 14 years. A new 95% efficient gas furnace, combined with the CURRENT low NG price, is hard to beat. That said, the best new split air source heat pumps are HSPF 13, or 44% more energy efficient than our model! Also, if you add in the fixed monthly service charge just for having NG service, the cost comparison is pretty much a wash for most of the USA with average electricity prices. The heating fuel comparison calculator from EIA is a nice tool for such comparisons, although I think it downgrades heat pumps too much in colder climates. For example, we lock out the backup electric heat strips on our hp down to 5F. This winter the strips only came on once when it was -5F outside early one morning, and then for only a short time. Many people falsely assume that a hp only operates down to 32F. Maybe if you're in a huge drafty old house with huge demands, then this is correct. If you're in an average sized home with up-to-date insulation, windows, etc., then air source heat pumps work very well.
Lastly, you're info. on the electric water heater got my attention. Ours is 50 gallon, .95 energy factor, 5500 watt elements, and rated 4800 kWh/yr. I had to look up the assumptions behind the yellow label because I know we don't use close to that much electricity for heating water. It turns out they assume 64 gal./day of hot water. We use app. half of that amount for our 3 member household. There's nothing special to accomplish this, just Bosch dishwasher and washing machine that are miserly and the water heater is located in the basement where it's 70F year round. Here is the water heater link:
http://energy.gov/eere/femp/energy-cost-calculator-electric-and-gas-water-heaters-0#output" onclick="window.open(this.href);return false;
Sorry to go off topic, but transitioning to electric cars in society will require energy efficiency to make it happen. I know it's doable.