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I read somewhere that these films can damage your windows. But if it means I can delay replacing them for a few more years than it would be worth it. My windows are construction grade windows. My guess is the minimum allowed by law at the time. (Like everything else) So if I can get more usable life from them then I am going to try. I don’t want to spend too much but I also don’t want to buy junk. After reading around on the Internet, I have decided on Gila window film from Lowes.

I will wait a few months, right now I want to sun to warm the house. Hopefully, for about $60, I can reduce the amount of heat gain on the south side of the house. This film will also reduce heat loss. Maybe I will buy a roll now and apply some on the backside windows. As inexpensive as it is, it is worth a try.

According to Gila’s website it is safe for double pane windows.


First, let me say, that this is not a good option for me. Why? The one Drainergy model won’t work with plastic pipes. The both companies I have found need a vertical section of pipe for replacement.

Here are both companies.


GFX Technology

Now, how does this thing work?

The vertical recovery systems use something called a film heat recovery idea. The concept is simple. The falling water in the drain pipe always “sticks” to the side of the pipe. Like rain on a window. Both manufacturers make vertical recovery systems. Both require a vertical section to be replaced with a copper pipe. That copper pipe has and external coil wrapped around it. As the falling drain water passes thorough the pipe it gives up its heat the the colder outer coil water line. The now warmer “cold” water is then feed into the water heater. This type of system is great for recovering heat from a shower type usage. Meaning you take a 20 minute shower and the system will work the best. If you take a bath then the system will not work hardly at all. But the next type will work.

The next type can be a horizontal or a vertical. The basic idea is to strap a “small” tank on the outside of the pipe. This type of system is more capable of capturing intermittent uses of hot water. (Think dishwasher and clothes washer)

Drainergy makes Vertical and Horizontal. GFX Tchnology makes only Vertical. O’well, I will just file this under my dream house plans.

This past month I used 7 CCF. A year ago this time I used 16 CCF. What is one therm equal to? For me, it is equal to running my furnace for a little over a hour. That would mean I would have “ran my furnace” for only 10 hours this past month. The usage come from my gas dryer. (Still waiting for a Heat Pump Dryer!) I installed my hot water heat pump about a week into the month. I figure that the dryer uses 5 CCF a month. I don’t know the efficiency of the dryer but I would think 100%. How many KWhrs are is 5 CCF of Natural Gas? If my math is correct. 150kWhrs. That is the reason I want to get a heat pump dryer. Still, the cost for an additional 150kWhrs is about $15 @ $0.10 a Kwhr. But, for me, the more I use the less I pay. If I am over 1000 kWhrs in a billing period it goes down to $0.05 per kWhr. So I may only pay $7.50 extra per month.

Currently my bill is only for $18.27. This would cost about the same if I were to have used electric instead of gas. ( 7CCF) I only have to replace my furance and dryer. Then I will not have to worry about gas ever again. (Don’t knwo what I am going to do with with my hardly ever use gas fireplace. Corn / Pellet Stove?)

Lastly, the kill-a-watt reading for my hot water heat pump is about 95kWhrs. For the billing cycle it will be slightly above 100 kWhrs. (10CCF for hot water = 300 kWhrs, I used 100kWhrs. That would be 300% efficent when compared to the gas water heater!)