Quote:
Originally Posted by viewguysf
I knew I had to replace my furnace before it stopped working, so sprang for a 95% high efficiency model with an added air purification system. A year and a half later (2017 going into 2018), I added central air conditioning. Because I live on the top floor of my building with windows facing in three directions, I’ve never regretted the decision. Even after having changed the roof from a traditional one to thick foam and having replaced all of my windows, which both greatly helped, it could get quite hot in here. Now, that’s not the case and I’m thankful. AC in San Francisco used to be extremely rare, but no longer, which further strains the electrical grid.
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That sounds like my Arizona house: foam roof coated with reflective silicone, moderate high efficiency A/C (since I'm not normally there in the summer, last time I replaced it I didn't go for the MOST efficient--got middle range). This year I stayed in AZ into the first week in June fearing SF would have a real problem with COVID so I was there on days it got to 105. But even so, I set the AC at 72 at night, then turned it off when I got up in the morning and the house stayed below 76 until about 3 in the afternoon. I was really amazed at how cool that roof keeps it. There are also roof overhangs all around so no direct sun coming in the windows either which probably helps and the walls are 1.5 ft thick masonry.
My condo unit in SF faces both east and west and the wind literally howls through when it's blowing at all. Many years I would not use A/C at all even if I had a central unit. I like having the windows open. Even in AZ, I keep them open most of the time during the months I'm there (usually Oct-April): And my cat gets very annoyed with me when I shut the door to the screened porch so she can't go out there.