If your air conditioning contractor is trying to sell you higher SEER equipment, or a new duct system, you should pay attention.
Your contractor is not trying to sell you something you don't need, he is looking out for your long term benefit... Installing a high efficiency furnace and air conditioner or a high efficiency heatpump with new properly sized ductwork is one of the few upgrades a homeowner can make that will actually pay for itself and then provide a return on their investment for years to come.
Energy Use Calculator Notes:
1. Input the system tons. (one ton = 12,000 btu's)
2. The only way to know your duct leakage is to have it tested. For reference: the state allows 15% leakage on old duct systems, and 5% on new duct systems.
We have tested "New Duct Systems" and found more than 40% leakage due to oversites by the installing contractor.
3. Return leakage will be sucking in hot ambient air from the attic. This will raise your supply temperature by several degrees.
4. Supply leakage will not affect the supply temp, but will waste money by leaking your cool air into the attic before it gets to the inside of your house.
5. Attic temperatures in the summer can range from 120 to 140 degrees.
6. You will never get 100% of the system BTU's delivered. A properly sized system in San Diego will allow aprox 30% of capacity for humidity removal.
7. Changing the SEER will change the cost of operation dramatically.
8. The cost of electricity varies. SDG&E published their 2017 rates as $0.20 per KWHR baseline and $0.42 per KWHR above baseline.