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.
Propane contains 91,547 Btu per gallon. A typical furnace will convert about 85% of that to heat, which means that 1 gallon of propane provides about as much heat as 23 kilowatt-hours of electricity. If propane costs $2.40, then electric resistance heat is cheaper if grid electricity costs 10 cents per KWH or less. typical furnace will convert about 85% of that to heat, which means that 1 gallon of propane provides about as much heat as 23 kilowatt-hours of electricity. If propane costs $2.40, then electric resistance heat is cheaper if grid electricity costs 10 cents per KWH or less.