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.
I've found that a 20 lb. tank of propane lasts about 23 hours of furnace usage.....yes, I made a chart and kept track of the run times! I have a propane fireplace at home which is the same BTU, and it too will drain a 20 lb. tank in about 23 hours of usage.Logged. lb of propane per hour of furnace run time is a good estimate. BTU per Lb. of Propane Gas 21,500. A 20lb propane tank might only have 15 lbs in it! If you set the thermostat low it lasts longer, 50F ain't is not that cold.