following information is provided to help educate you about heating
and cooling systems, and to possibly help you make a more informed
decision about what the best systems are for your home.
following links provide valuable information provided by the Federal
Trade Commission regarding heating and cooling systems:
or natural aspirating, furnace has a 60 to 70% efficiency.
The unit has a large air requirement in order for exhaust gases to
vent up through a chimney. In most jurisdictions, a conversion from
oil to gas requires a metal liner in the chimney to ensure proper
draft to reduce condensation.
is similar to a conventional furnace but achieve a 75 to 85%
efficiency. It does so by incorporating an induced draft fan.
Some units also have a motorized damper, that closes when the
unit is off so that heated air is not lost up the chimney. In some
areas, units with plastic flues (about five inches in diameter) from
the furnace to the chimney are not be permitted and must be
replaced. Check your local utilities office for regulations
concerning plastic vent pipes for mid-efficiency furnaces in your
or condensing furnace, achieves a 90 to 97% efficiency.
Increased efficiency is due to a secondary heat exchanger that
extracts heat from the exhaust gases that will normally flow up the
chimney. Instead of a flue, the unit incorporates an induced
draft fan or power vent fan and plastic piping to vent
the cooled gases through a side wall.Condensate drainage piping
carries the condensate from the cooled gases to a waste pipe. In
some units, a pump discharges the condensate to the exterior. Units
with a sealed combustion system also have an intake air duct so that
outside air is used for combustion. A pulse-combustion
produces about 60 to 70 tiny explosions of air-gas mixture per
second in the combustion chamber instead of a continuous flow of
fuel as with most common high-efficiency units. Since this system is
noisy, a vibration isolator (canvas fabric) is installed between the
furnace and plenum.
free to call anytime for a consultation, and we together we can
determine which product is the best for your home.