Dew point is the tempurature the air cannot hold the weight of the water in it. The water then begins to condense and form droplets. This tempurature is always below or equal to the air tempurature.
Propane prices. Maine (ME) propane users spent an average of $2.724 per gallon over the 2012-2013 heating season. This is slightly higher than the 2.436 average for the country as a whole, for the reasons explained above (distance from major supply source, colder climate, higher demand).
Current electric charges in the area are about 15Â¢ per kWh, natural gas is about $1.40 a ccf, propane is about $3.00 a gallon, and oil is about $3.20 a gallon. The annual cost to heat a 2200 square foot existing house of average energy consumption for different combinations of fuels and furnaces: 1  Natural Gas in an 80% furnace: $1215. 2  Natural Gas in a 92% furnace: $1095. 3  Oil in a 70% furnace: $2185.  Oil in an 80% furnace: $ 1 2004. Propane in an 80% furnace: $3143.  Propane in a 92% furnace: $2632.