Whole House Attic Fan
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A whole house attic fan is a relatively inexpensive and easy to install option for
cooling your entire home. The fan draws cool outdoor air inside through open
windows and exhausts hot room air through the attic to the outside. The result is
excellent ventilation, lower indoor temperatures, and improved evaporative cooling.
What Are The Benefits?
A whole house fan can be used as the sole means of cooling or to reduce the need
for air conditioning.
Outside air temperature and humidity dictate times when the whole house fan
would be favorable over air conditioning. If both methods of cooling are present, a
seasonal use of the whole house fan (during spring and fall) may yield the optimum
combination of comfort and cost.
What Are The Drawbacks?
A whole house fan has some drawbacks: the fan can only cool the inside of a house
to the outside temperature; unlike an air conditioner, it does not dehumidify; and
dust and pollen can be brought into the house.
Economics of Operation
Operating a properly sized 2-ton, 10 SEER air conditioner in Atlanta, Georgia costs
over $280 per cooling season (1250 hours), based on 9.5¢/kwh, or roughly 22¢ per
hour of runtime. A large 18,000 Btu/hr window unit air conditioner with a 6 EER
costs more than 25¢ to operate for one hour.
By contrast, the whole house fan has a motor in the 1/4 to 1/2 hp range, uses
between 120 to 600 watts, and costs around 7¢ per hour of use.
What Size Fan Do I Need?
Whole house fans are rated by the number of cubic feet per minute (cfm) of air they
exhaust from the building. The HV1600 fan shown below is rated at 1,600 cfm and
would change the air in a 1,000 square foot home approximately once every 5
minutes; a 1,500 sq ft home every 7 1/2 minutes; and a 2,000 sq ft home every 10
minutes.
The Home Ventilation Institute recommends one complete air change every two
minutes within the occupied area. This is unrealistic since it would require either one
very large, noisy, and expensive fan, or multiple smaller fans installed in the ceilings
of individual upstairs rooms.
A more sensible approach for most homes is to opt for a single unit with moderate
air flow. The most popular whole house fans shown below will satisfy most home
owner's desire for relatively quick cooling with a minimum of noise and expense.
Cooling Strategies
During the morning and late evening, the outside air is often cooler and can be used
to replace the inside air. It is important to partially open several windows to ensure
adequate airflow. Closing windows in unused rooms will create higher velocity air
movement in occupied rooms.
Running the whole house fan whenever outdoor temperatures are lower than
indoor will cool the house. Operate the whole house fan throughout the evening to
cool interior materials. An approximate rule of thumb would be to use the whole
house fan when outside temperatures are below 85°F.
As daytime temperatures rise, turn off the whole house attic fan. The cool room
materials (along with ceiling or circulating fans which create an additional cooling
effect) will help keep the interior more comfortable.
cooling your entire home. The fan draws cool outdoor air inside through open
windows and exhausts hot room air through the attic to the outside. The result is
excellent ventilation, lower indoor temperatures, and improved evaporative cooling.
What Are The Benefits?
A whole house fan can be used as the sole means of cooling or to reduce the need
for air conditioning.
Outside air temperature and humidity dictate times when the whole house fan
would be favorable over air conditioning. If both methods of cooling are present, a
seasonal use of the whole house fan (during spring and fall) may yield the optimum
combination of comfort and cost.
What Are The Drawbacks?
A whole house fan has some drawbacks: the fan can only cool the inside of a house
to the outside temperature; unlike an air conditioner, it does not dehumidify; and
dust and pollen can be brought into the house.
Economics of Operation
Operating a properly sized 2-ton, 10 SEER air conditioner in Atlanta, Georgia costs
over $280 per cooling season (1250 hours), based on 9.5¢/kwh, or roughly 22¢ per
hour of runtime. A large 18,000 Btu/hr window unit air conditioner with a 6 EER
costs more than 25¢ to operate for one hour.
By contrast, the whole house fan has a motor in the 1/4 to 1/2 hp range, uses
between 120 to 600 watts, and costs around 7¢ per hour of use.
What Size Fan Do I Need?
Whole house fans are rated by the number of cubic feet per minute (cfm) of air they
exhaust from the building. The HV1600 fan shown below is rated at 1,600 cfm and
would change the air in a 1,000 square foot home approximately once every 5
minutes; a 1,500 sq ft home every 7 1/2 minutes; and a 2,000 sq ft home every 10
minutes.
The Home Ventilation Institute recommends one complete air change every two
minutes within the occupied area. This is unrealistic since it would require either one
very large, noisy, and expensive fan, or multiple smaller fans installed in the ceilings
of individual upstairs rooms.
A more sensible approach for most homes is to opt for a single unit with moderate
air flow. The most popular whole house fans shown below will satisfy most home
owner's desire for relatively quick cooling with a minimum of noise and expense.
Cooling Strategies
During the morning and late evening, the outside air is often cooler and can be used
to replace the inside air. It is important to partially open several windows to ensure
adequate airflow. Closing windows in unused rooms will create higher velocity air
movement in occupied rooms.
Running the whole house fan whenever outdoor temperatures are lower than
indoor will cool the house. Operate the whole house fan throughout the evening to
cool interior materials. An approximate rule of thumb would be to use the whole
house fan when outside temperatures are below 85°F.
As daytime temperatures rise, turn off the whole house attic fan. The cool room
materials (along with ceiling or circulating fans which create an additional cooling
effect) will help keep the interior more comfortable.
Alternative-Heating-Info.com
| Ghost R-38 |
| TC1000H Flat Roof or Exterior Wall Mount |
Ghost R-38 Rated For Homes Up To 3500 Sq. Ft.
*2 Speed Remote Control
*Built-In Auto Closing Insulated Doors R-38
*Sound Level Low: Quiet (1900 cfm)
*Sound Level High: Moderate (3400 cfm)
*Doors close automatically when not in use
*12" insulated doors create tight seal
$1449.00
*2 Speed Remote Control
*Built-In Auto Closing Insulated Doors R-38
*Sound Level Low: Quiet (1900 cfm)
*Sound Level High: Moderate (3400 cfm)
*Doors close automatically when not in use
*12" insulated doors create tight seal
$1449.00
HV1600 R-38 Rated For Homes Up To 2500 Sq. Ft.
* Easy To Install Into Most Existing Homes
* 2 Speed Remote Control Operation
* 120 VAC Line Cord - No Complicated Wiring
* Low Speed Sound Level: Low Approx. (1150 CFM)
* High Speed Sound Level: Moderate (1600 CFM)
*12" insulated doors close automatically when turned off
$949.99
* Easy To Install Into Most Existing Homes
* 2 Speed Remote Control Operation
* 120 VAC Line Cord - No Complicated Wiring
* Low Speed Sound Level: Low Approx. (1150 CFM)
* High Speed Sound Level: Moderate (1600 CFM)
*12" insulated doors close automatically when turned off
$949.99
TC1000H Covers About 1000 Sq. Ft Of Living Area
* For Homes With No Attics
* Motorized Insulated Dampers
* Sound Level: Quiet (800 cfm)
* Can Be Mounted On Roof - Or Vertically On Wall
* Seals Tight When Turned Off
$859.00
* For Homes With No Attics
* Motorized Insulated Dampers
* Sound Level: Quiet (800 cfm)
* Can Be Mounted On Roof - Or Vertically On Wall
* Seals Tight When Turned Off
$859.00
Dayton 1LXN7 Rated for homes up to 5,500 Sq. Ft.
* CFM High 5900 - CFM Low 3900
* Height 15 In - Width 34 In - Depth 34 In
* Includes:
* 1x4 Wooden Plenum Box -
* Two-speed switch
* 12-hour timer
$640.00
* CFM High 5900 - CFM Low 3900
* Height 15 In - Width 34 In - Depth 34 In
* Includes:
* 1x4 Wooden Plenum Box -
* Two-speed switch
* 12-hour timer
$640.00
Attic Aire 54301 Whole House Fan Rated for 1,500 Sq. Ft.
* Direct-drive whole house fan with shutter
* Two speed operation - pull-chain switch
* Heavy steel housing
* Durable powder-coated finish
* Can be mounted without cutting attic joist
$199.99
* Direct-drive whole house fan with shutter
* Two speed operation - pull-chain switch
* Heavy steel housing
* Durable powder-coated finish
* Can be mounted without cutting attic joist
$199.99
