by nate33 » Wed 16 Jan 2008, 18:14:06
$this->bbcode_second_pass_quote('Pixie', '')$this->bbcode_second_pass_quote('nate33', 'D')on't worry too much about saving electricity in the winter. Incandescent bulbs, dirty refrigerator coils, etc. don't really hurt you much because the energy that is "wasted" is technically just heat energy which will ultimately reduce the energy required to heat your home. The same goes for your hot water heater and hot water pipes.
In winter, the only thing that really matters is the insulation separating the living areas of your home from the unheated exterior. Everything else is just details.
Obviously, the summer is a different story.
UNTRUE!
Energy saving appliances help at any time of year. A few years ago, I bought a tankless hot water heater and a front load washer. Since I heated both my water and my home with natural gas, I thought it might be a wash in the winter time, because the waste heat was heating the house. I found instead that both of these saved me on my natural gas bill, even in the winter.
I kept really close records of my energy use when I had my own house. I tracked my daily energy use versus outdoor temperature before and after on an excel spreadsheet. I then used the statistical features of Excel to plot the closest fit line on each set of data, and found that outdoor temperature explained about 90% of the variability in my energy use before I bought the tankless heater and after. However, the entire line shifted downward after the purchases. Regardless of the outdoor temperature, I saved energy by reducing my water heating costs. In fact, my savings were much higher in the winter than in the summer.
Remember that the water flowing into your house is COLDER in the winter than in the summer. It takes more energy to heat it to the desired temperature in the winter. The more efficiently you can do that, the more you will save.
I question your tracking methods.
This is a simple matter of physics. Any "wasted" electricity is wasted as heat. Any "wasted" energy in your hot water heating system is wasted as heat. As long as the heat is wasted inside your house, then it is collected in your house and will reduce your home heating cost.
Now, if your natural gas costs substantially less than electric heat, then you are better off "conserving" your electricity and shifting more of your home heating burden to natural gas. But I'm speaking purely in terms of total energy saved, not money saved. (I'm ignoring the wasted electrical energy involved in power transmission. That's probably much less efficient that the transmission of energy via natural gas piping. I'm no expert on the matter.)
To take the argument to the extreme, it would be almost as efficient to heat your house by simply leaving the refrigerator door open, as it would be to utilize an electric space heater. (The only minute difference is that some of your refrigerator's energy is converted to kinetic energy in the compressor and movement of the refrigerant. Kinetic energy does nothing to heat your home.)
There are some exceptions. Dryer heat is wasted to the exterior which is an extraordinarily wasteful process. Hanging your clothes would certainly save substantial energy over drying them.