Water Heater is the second largest contributor to the energy bill after the air conditioner/central heat. Water has high heat capacity, so it takes a lot of energy to warm up. For example, it takes one kilowatt-hour to warm up about 10 gallons of water from 80F to 120F. Your electric [...]

Same as with the air conditioner, heating your house can take up a significant chunk of your energy bill.  It is not easy to estimate the energy use by your heater, it depends on the size of your house, how well the house is insulated, the temperature outside and the efficiency of the heating unit.  [...]

Energy spent on the air conditioner can take up a significant chunk of your energy bill.  It is not easy to calculate the energy use by the central air conditioner, because it depends on the climate you live in, the thermal insulation of your house, the air conditioner type and its efficiency.  But, nevertheless following [...]