Another thing that people often point to as a negative thing about ketosis is that people can suffer symptoms such as headaches and dizziness in the first few days of a ketogenic diet. Also, athletic performance can suffer until the body adapts to using fat for energy instead of glucose.
Forced air furnace heat exchangers have an average life expectancy of 15 years, with a range typically between 13 and 20 years. Most heat exchangers used in models today today will last between 15 and 25 years and are usually made from aluminized or stainless steel.
How long does a home furnace last? I have a Carrier furnace that was installed in 1995, and the other day the fan unit died, to the tune of $685. I'm guessing that the furnace may not last much longer, but I wondered what wisdom others may have about this kind of thing. Can I get 20 years out of it, or should I start saving for... It should last another 20 years but its probably still going to need repairs within that time.