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Engineer is absolutely wrong. The transfer of cold to warm is a mathematical inversion. The lower the inside temp, the faster is attempts to equalize.
The slow movement of the fan blades have almost no effect on the air temp. After 30 years of heating and cooling experience, I have learned a thing or two. The direction of rotation is not important - circulating the air is. If you set the thermostat to 55, how long will it take the furnace running to warm the house back up to 68? And setting the thermostat at 80 will not warm up any sooner. 55 to 68 takes the same time no matter the setting. Unless your outside walls are R50, and the house is air tight, there is always transfer. But then you will be sick all the time, as you will be re breathing the air you exhaled.
"As the temperature difference decreases between
the wall surfaces, the rate of air flow increases and the effective R-values
of conventional insulations decrease"
Do not listen to Energy Star. The programmable thermostat will save you enough money to go to McDonalds. A house is a box. the outside walls need to warm up so the interior can hold heat or cooling. The lower the inside temp., the more rapid the cold air infiltrates. if you lower the thermostat to 55 when gone for a weekend, the furnace will cycle more often than if you leave it at 65.
Save on heating and cooling by using a ceiling fan. Doesn't really matter which direction it runs - moving the air is the objective. Run it at the slowest speed. If your thermostat says 70 on the gauge, it will be over 80 at an 8 foot ceiling. A fan will get that heat down where you need it, and the furnace won't cycle so often. In northern winters a fan can save 20 to 50 dollars a month on heating alone. Of course, if you have 4 or five active kids, they'll keep the air moving too. For cooling it helps the temp stay more even at all levels in the room. Forget the designers, they want things pretty for tv, and don't care about comfort.
Also, if you have cast iron radiators, DO NOT paint or cover them. One coat of paint reduces their efficiency by 10%, covering with a pretty wood surround reduces them by 40 to 50%. Copper radiators are inefficient - what heats up fast, cools off fast. cast iron will stay hot for half an hour after the boiler shuts off.
i think the same what has to do buying new washing machine or dryer with energy saving?