New Windows

Milgard_logoA Couple weeks ago, we had new Milgard windows installed on our house. The windows that were in the house were standard, 1978, double glazed, aluminum windows. They weren’t terrible, but they weren’t great either. A couple had popped seals (moisture inside), and they would grow mold on the frames from condensation. While we fully realize that window upgrades RARELY pay for themselves in terms of energy savings, we did hate the mold and look of the other windows (plus the fact some had blown seals), we did go ahead and make the purchase1.

While the install took all day, the result after the fact has been great. The windows LOOK much better, and I’m fairly certain my allergies have been better (mold removal is always good). For my own interest sake, I’ve compiled info on the windows that you can  (if you care to) see here (PDF download). Information is mainly for my sake, and includes model of the window, size, features, and most importantly U-Value (inverse of R-value), SHGC (Solar Heat Gain Coefficient), and VT (Visual Transmittance) info.

Otherwise, this post is pretty much at an end (for now).

  1. plus, our utility company offers a 0% 5 year loan to cover tho costs []

My First Oscilloscope

Rigol DS2072As I mentioned in my previous post with the TTi EL302P I’ve been extremely interested in electronics of late, and have been looking for a good Oscilloscope. The quest for a ‘scope lead me, like many others to eevblog’s forum. And at first, it seemed like it was going to be a Hantek or an Owon, but the forums pretty much changed this to be a question of the two Rigol options. The Rigol DS1052e ($330), or the DS2072e ($829). And the question really is do  you spend $330 on a scope and get something that’s about five years old, and lacks a lot of features, or do you buy something that’s about 2.5x more, and get something that’s modern, and has a lot more features than the older model.

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A quick note about Heat pumps

xl15iLast week, I had my yearly service performed on my heat pump system. They come out and clean the coils, and check everything to make sure it’s working. This year, though, the tech said there was something questionable, in that the subcool was too high, and that there seemed to be too big a temperature change on each side of the liquid line filter drier (LLFD). So, they suggested a service tech come out, and take a look. Fine, though I wasn’t looking forward to the cost.

Knowing resources are out there, I posted on the hvac-talk forums here, and got some opinions before the tech came out. Alas, the useful bit I didn’t get until after the tech came out. The key bit being: you can’t accurately measure subcool and superheat when the heat pump is in heating mode. So if your maintenance people tell you the subheat or subcool are off, and it’s 40°F out, and your house is being heated, you can PROBABLY ignore them. Obviously if they’re WAY off, it could mean something, but by and large, they’re only relavant in cooling mode. That is all. =)