Deep Energy Retrofit: HVAC Overhaul

Excess radiators can be eliminated as well. Modulating aquastats for hot water boilers adjust the hot water temperature to the outside temps and can save 10 percent in fuel costs. And a time-delay relay for hot-water boilers causes hot water to circulate through the system without firing the boiler. An oil-fired system can also benefit from a barometric flue damper that prevents too much heat from going up a chimney. The Department of Energy offers more details on gas and oil system retrofit options.

In these cases, adding a dehumidifying heat pipe can help. The process by which they work is a bit complicated, but they can be retrofitted to most air conditioning systems and heat pumps. They’re typically located on either side of the air conditioner’s evaporator coil.

If you have an old, inefficient burner on an oil boiler, though, you may want to replace the whole burner. A flame retention burner will block airflow up the chimney when the unit isn’t running, saving up to 20 percent on fuel costs at a cost of about $500, says the DOE.

For air conditioning systems, if you have an older central air conditioner, you might choose to replace the outdoor compressor with a modern, high-efficiency unit. If you do so, consult a local heating and cooling contractor to assure that the new compressor is properly matched to the indoor unit. Air conditioning systems naturally dehumidify the air as they cool your home, but may not be able to keep up with the humidity in some very humid climates.


Post time: Mar-18-2017
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