Re: antique refrigerator repair
You're right, really old refrigerators may actually be more efficient than middle-aged ones. Your old refrigerator probably has an ammonia-based or another, toxic refrigerant. In the 1950's, due to concerns of toxins and breakthroughs in technology that made the manufacture of CFCs inexpensive, refrigerator manufacturers switched to CFCs, primarily R-12. The CFC refrigerants were less energy efficient than the earlier refrigerants, but cheaper and non-toxic and in some cases, non-flammable.
Then along in the 1980's, environmental concerns for the ozone layer and potential for contributing to global climate change caused a switch away from CFCs (Chlorinated Fluorocarbon) to HFCs (hyrdrofluorcarbons) primarily, R-134a, which is somewhat more efficient. This also coincided with a drive for greater energy efficiency, which in the case of refrigerators mainly was achieved through the use of better insulation.
The "Senior Member" designation under my name doesn't mean I know a lot, it just means I talk a lot.I've been a DIYer since I was 12 (thanks, Dad!). I have read several books on various home improvement topics. I do not have any current code books I can refer to. I was an apprentice plumber for two years.