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Installing And Using A Whole House Fan

by Brett Dunne
U.S. Department of Energy - Energy Efficiency and Renewable Energy
Building Technologies Program
Installing And Using A Whole House Fan
 
 
 
 
 
Why Use A Whole House Fan?
A whole house fan is a simple and inexpensive method of cooling a house. 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.
First cost benefit
Equipment cost for whole house fan = $150-$350
Equipment cost for window unit AC = $250-$750
Equipment cost for central AC = $2,000-$4,000
Ventilation
A whole house fan can be used to change the air in the house and vent odors quickly.
Economics of operation
Operating a properly sized 2-ton, 10 SEER air conditioner in Atlanta, Georgia costs over $250 per cooling season (1250 hours), based on 8.5¢/kwh, or roughly 20¢ 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 1¢-5¢ per hour of use.
What Are The Drawbacks?
Temperature, humidity, and dust
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.
Maximize Your Savings
During the winter months (and summer when air conditioning is used), a whole house fan represents a potential energy loss because it is essentially a large, uninsulated hole in the ceiling. Standard fan louvers do not insulate or seal tightly.
Build and use fan covers

Because the louvers are leaky, a cover should be constructed to airseal and insulate this hole during the seasons when the fan is not in operation. The cover may be installed from the attic side if attic access is easily available or from the house side. Both covers could be included in excessively hot or cold climates. Homeowners must remember to remove cover(s) before operating the fan and to replace cover(s) during seasons when the fan is not in use.
Whole House Fan with Attic-side Cover
 
Whole house fans have either a direct drive motor (pictured) or a belt and pulley drive to turn the fan blades.
 
Cooling Strategies
In the summertime, the air inside a home is heated during the hot part of the day. At night especially, and 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 open all or at least several windows, even if only partially, to provide 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 fan. The cool room materials (along with ceiling or circulating fans which create an additional cooling effect) will help keep the interior more comfortable.
Installing A Whole House Fan
How To Build An Attic-side Box Cover
A typical whole house fan has a 30" diameter blade with a sheet metal cowling of 31" to allow for blade clearance. An attic-side box cover may be constructed from a 4' x 4' piece of 1" rigid fiberglass duct board. The box will be 33" square with 1" thick walls (inside dimension of 31" x 31"). It will be 6 1/2" deep. Adjust dimensions to actual fan size.

Attic-side box cover materials list:
  • 48" x 48" piece of 1" fiberglass duct board
  • Silver duct tape or house wrap tape
  • Tools; measuring tape, straight edge, utility knife
  • Permanent marker to label box
  • Wear gloves and eye protection when working with duct board
 
Box Cover
 
Cut out and discard four corners
 
 
 
Fan Cover Detail
 
Add silver duct tape to corners
 
Use "H" Brackets To Provide Proper Support
When installing a whole house fan, be sure to provide proper support and seal the unit into the rough opening in the ceiling. Never cut a truss chord; wooden "H" brackets installed between the trusses create a framed box to raise the fan above the truss system. The louvers must be able to operate freely (open/close) and care must be undertaken to prevent binding or misalignment.
H Bracket Detail
 
"H" brackets make fan installation easy. A fan with a 34" base (30" blade) will work with the dimensions shown.
 
Helpful Reminders
Attach labels to remind users to remove energy-saving covers.

Label the attic-side box cover
  • "WHOLE HOUSE FAN COVER"
  • "REMOVE BEFORE OPERATING FAN"
  • "REPLACE WHEN NOT USING FAN"
Selecting A Whole House Fan
Fan speed
Two-speed fans permit the entire house to be ventilated quickly on high speed (such as when the occupants first arrive at home) and then provide gentle air circulation at the lower, quieter speed. Variable speed units offer more flexibility in selecting the desired air movement.
Control options
Controls may be simple on/off pull or wall switches, multi-speed rotary wall switches, or a timer which automatically shuts off the fan at pre-selected time intervals.
Louvers
Dampers or louvers typically operate automatically whenever the fan operates. Motorized dampers are available but are not necessary if the louvers are correctly installed and maintained. Proper opening and closing of louvers is critical to a whole house fan's performance.
Motor mounts and noise
A direct drive unit has its fan blades attached directly to the motor's shaft. It is usually less expensive to buy and operates at higher rpm's than its belt driven counterpart. A belt driven unit, which typically features a motor driving a slower moving, larger diameter fan with four or more blades, may be quieter, but will require maintenance of the pulley and belt.

In addition to sizing a whole house fan correctly, it is important that ALL penetrations between the attic and living space are sealed and that the attic is properly ventilated. A central hallway, or a stairway in a two-story house, is the most common location.
Sizing A Whole House Fan
Determining the amount of airflow in cubic feet per minute (cfm) that the whole house fan should provide involves a simple calculation. Multiply the total gross square footage of the house (include upstairs area) by the ceiling height (typically 8 feet). Select a fan that delivers between one half to one times that amount of cfm at 0.1" static pressure. For example, a 25'x40', one-story home is 1,000 square feet and would need an 8 x 1,000 x 0.5 = 4,000 cfm fan or better. A manufacturer sells a two-speed unit that delivers 4,500 cfm at the high setting (240 watts) and 3,200 cfm at low (120 watts); this unit should be adequate.
Installation Tips And Concerns
Seal penetrations and vent attic adequately
Caulk all penetrations between the attic and living space, i.e., electrical boxes for ceiling light fixtures, loose attic hatches, large cutouts for plumbing vents, exposed beams, and recessed lights. A whole house fan creates a positive pressure in your attic and it is important that air from the attic is not forced back into the living space through cracks and gaps.

Guidelines for sufficient attic vent area is one square foot of net free vent area per 750 cfm of fan airflow, (4,500 / 750 = 6 square feet for the example above). Continuous ridge and soffit vents are usually more than adequate. Vents with insect screens may have a net free area equivalent to 1/2 of the total open area depending upon the size of the holes in the screen area. Insulation should be installed directly against the fan box frame. Blown-in insulation may require the sides of the fan box to be raised (with baffles) to prevent interference.
Avoid backdrafts
Care should be taken to avoid backdrafting combustion appliances that are installed in the conditioned space. It is strongly recommended that combustion appliances NOT be installed in such a manner that they use room air for combustion. The whole house fan is capable of pulling large quantities of air from the home and, particularly if not enough windows are open, may easily backdraft a water heater located inside a louvered closet door.
Label your switches
Controls should be placed higher on walls than light switches to avoid confusion and to keep them out of the reach of small children. Labels over switches are recommended to remind users to remove any energy-saving covers and to open at least two or more windows before using.



U.S. Department of Energy
Content Last Updated: 04/21/2005

What Is A Short Sale?

by Brett Dunne

Answer: In some areas of the country, and from time to time, real estate values decline.

In such situations it sometimes happens that owners need to move but the value of the mortgage is greater than the value of the property. The owner is said to be financially "upside down."

If the property is sold at a loss, the owner is still responsible for repaying the entire mortgage nationally (a purchase money mortgage in California may be an exception -- see an attorney for details). But, sometimes owners do not have enough cash to re-pay the loan and so they try to work out a deal with the lender to pay less than is owed -- a short sale.

The lender, of course, wants back every dime loaned to the borrower. That was the deal. And lenders point out, properly, that if the value of the property rose the borrower would not turn around and be required to offer some of that profit to the mortgage company.

Lenders will sometimes allow a short sale if it is a better alternative than a foreclosure sale in a down market. However, before making such a decision, a lender will want to see how such a deal can be structured. Perhaps the borrower has other assets, or perhaps the short-fall can be made up with a note to the lender.

If the lender takes a loss, that loss may be reported to the IRS as income to the borrower -- money not actually received by the borrower, but money that is taxable.

In the event that a borrower faces a short-sale situation, the best approach is to have an attorney contact the lender on your behalf. It may be possible to work out a different monthly payment, an interest rate lowered to current levels, a long extension, etc.  

See a tax professional and realty attorney for details before making any decisions.

Short Sale In The Luxury Home Market

by Brett Dunne

Some of the more difficult listing appointments our group encounters these days are ones that involve short sale conditions. In this situation, the seller owes more on the property than what it is worth in the current market.

A year or so ago, we were having to explain how short sales worked to anguished sellers. These days, sellers call us, say they are underwater with their mortgages, and ask if we can help get them out from under crushing and/or mounting debt. And contrary to popular belief, short sales are not only occurring in condo conversions and lower end properties, but in the luxury home market as well.

How and why do short sales present such potential for real estate investors and home buyers? Most short sales situations we encounter in San Bernardino county involve homes that were purchased in the last two years with 100 percent financing, or homes that had been refinanced—often a number of times. Many of these properties are also encumbered with Option ARM mortgages, whose rates have reset to unaffordable rates and may have negative amortization. 

No well-advised buyer would pay an inflated price for a home to accommodate a home seller’s inflated mortgage debt.

In fact, we routinely check the outstanding mortgage debt on properties we show to home buying clients to check short sale potential. Many buyers don’t want to go through the protracted hassle of waiting for lenders to respond to offers. Others are willing to trade time for opportunity. Regardless, we feel compelled to advise buyers of the possibility.

It may be anecdotal evidence, but we seem to be encountering more homes at the low end of the luxury market that will likely be sold under short sale conditions. In the San Bernardino market, many of these properties are newer tract homes that are in the $500,000 to $1,000,000 These sellers have also had the added burden of having to compete with builder’s inventory that is/was being sold with ultra-generous incentives.  

And what does the near-term future hold for short sales in the luxury home market? Difficulties will arise with some of the luxury home purchases and refinances that were accomplished with Option ARMs and their “teaser” entry rates. A million dollar mortgage that originated 30 months ago and had payments starting around $2600 per month could now be readjusting to just under $7000 per month. And refinancing out of these products is often daunting, because of hefty prepayment penalties.   

It is a story that is still under development.  – Roberta Murphy

 

Rancho Cucamonga City Facts

by Brett Dunne
CITY facts
 
GEO facts
CITY size
39.08 square miles
POPULATION¹
147,000
ELEVATION
1,382 feet
AVERAGE temperature
67 degrees Fahrenheit
PROXIMITY facts
5 minutes to
L.A./Ontario International Airport
30 minutes to
Los Angeles
45 minutes to
LAX
90 minutes to
San Diego
3 hours to
Las Vegas
HOUSEHOLD facts 
MEDIAN income 
$67,752
AVERAGE income 
$80,897
MEDIAN age
32.2 years
MEDIAN size
3.09 persons
COLLEGE graduates
23.3% of wage earners
HOME price average (New)
$342,710
HOME price average (Existing)
$306,129
BUSINESS facts
BUSINESS licenses
7,112
JOBS²
50,790
TAXABLE sales
$1.3 Billion 
TOTAL personal income
$3.56 Billion 
 
 
¹ Source: CA Department of Finance, E-5 Reports
 
² Source: CA Employment Development Department. 
Revised 03/31/04
 

First-Time Homebuyer Program For Rancho Cucamonga

by Brett Dunne
First-Time Homebuyer Program For Rancho Cucamonga
The City of Rancho Cucamonga, through the City's Redevelopment Agency, has established a First-Time Homebuyer Program (FTHB) as a way of helping working families purchase their first home in Rancho Cucamonga.
The FTHB Program provides a silent second loan to bridge the gap between the first mortgage a buyer can qualify for and the cost to purchase a home. This cost may include part of the down payment and closing costs.
How It Works:
·         The buyer may qualify for a maximum loan amount up to $80,000.00.
·         The loan is forgiven after 45 years. The loan must be repaid if the home is sold, refinanced, or converted to rental property plus 15% or 10% equity share depending when the home is sold or refinanced.
·         Participants must join in a savings program, contribute 50 to 100 hours of community service and attend a Community Homebuyers Workshop.
·         Participants must apply for loans with a Neighborhood Housing Services (NHS) approved lender.
How To Qualify:
·         A buyer must show a need for assistance through Rancho Cucamonga's FTHB Program.
·         The buyer must qualify for a 1st trust deed loan with an NHS approved lender.
·         Borrowers must provide a minimum of three percent of the home purchase price to apply towards the down payment and closing costs.
·         To qualify for Rancho Cucamonga's FTHB Program, a buyer may not have owned a home within the past three years.
·         The household income may not exceed the following guidelines:
Family Size
Maximum Income
1
$36,270
2
$41,400
3
$46,620
4
$51,750
5
$55,890
6
$60,030
7
$64,170
8
$68,310
Neighborhood Housing Services Of The Inland Empire (NHS) is the administrator of the First-Time Homebuyer Program for the City of Rancho Cucamonga. As part of the FTHB Program, NHS provides a free Community Home buying counseling services to help potential home buyers resolve credit, debt, and savings concerns. Please contact NHS for further details and qualifications at (909) 884-6891.
 

Organizing the Garage

by Brett Dunne

Organizing the Garage
TIPical Mary Ellen : Episode TIP-237

Brett Dunne at DayBreak Group

agrees with Pam:

Organization expert Pam Hix offers tips on getting your garage in tiptop shape.


  • To organize small tools in the garage, tack an old belt to the edge of a shelf or cabinet at two-inch intervals. Slide tools into the slots for easy retrieval.

     

  • Hang an old tire against the back wall of the garage. This way if you come into the garage too fast, you will hit the tire, not the wall.

     

  • Hang old cabinets on garage walls. Use them to lock up harmful substances.

     

  • Mount a fold-down table on the wall for repair work and other tasks.

     

  • Hang a net across the ceiling of the garage to hold large and light items. Make sure the net does not interfere with the garage door.

     

  • Utilize used glass jars such as jelly or baby food jars, and screw the lid into a 2-by-4 piece of wood. Hang the piece with lids facing down so that you can grab the jar and twist on or off. This is a great way to store nails, screws or bolts.

     

  • Install wire shelving instead of wood. The wire shelving is easier for you too see what’s on higher shelves, and it’s virtually dust free.

     

  • Use a piece of plywood for hanging tools, shovels and brooms. Magnetic strips screwed into the plywood will hold lightweight tools. The others can be hung with nails.

Air Conditioner Maintenance

by Brett Dunne
Keep AC Costs and Energy Use
Down with Easy Maintenance
It's time to think about getting the most from your air conditioner (AC) this summer. A combination of professional and homeowner maintenance for the AC unit will keep costs and energy use down.
Brett Dunne at DayBreak Group Shows What a Homeowner Can Do
  • Clean or replace the AC filters monthly. Dirty air filters cause the AC unit to work harder than necessary. The energy bill can act as a monthly reminder to do this—change the air filter before sending out the bill.
  • Keep the grass around the AC trimmed, being careful not to blow debris or grass clippings into the AC. Make sure landscaping does not block the outdoor air conditioner components. Four to five feet of open air between any shrubs or trees and the AC unit will ensure proper airflow. Blocked AC units have a harder time taking in air to cool the home, which means higher energy costs.
  • Shade the outdoor AC unit. Air in a shaded space is typically five to six degrees cooler than the surrounding air, which means the AC will have an easier time cooling the air before pumping it into the home. Air conditioners with proper shading can be up to 10 percent more efficient over a cooling season, according to the U.S. Department of Energy.
  • Insulate ducts. Sealing ducts will save energy and money year round. First, seal the duct joints and leaks with mastic tape or sealer. Plain duct tape is not recommended because it will dry out and peel off over time. Wrap the ducts with low-cost, foil-faced R08 rated fiberglass insulation (recommended for cold climates like Iowa), and seal the insulation seams with regular duct tape. According to the U.S. Department of Energy, insulating ducts in the typical American home costs about $250, but the improvement will pay for itself in energy savings in two and a half years. Even the added cost of hiring a professional to install the insulation will be repaid with the energy savings.
  • Clean off dirt buildup on the indoor and outdoor coils of the central AC system. These heat exchangers between the refrigerant and the surrounding air can quickly build up impurities will hinder the coil's performance by as much as 8 percent. Both indoor and outdoor coils can be cleaned with warm, soapy water, but need to be treated gently. Before performing any maintenance, be sure to consult the manufacturer's recommendations to answer any questions about an AC unit's care.
  • Recirculate air. It is far more economical to recirculate and cool the indoor air than to draw in hot air from outside, cool it down and remove the moisture in it.
  • Raise temperature settings. Each degree of temperature can represent up to 9% savings or added expense in cooling costs.
  • Keep the unit fan on “AUTO.” IT is not necessary to run the fan constantly when the air conditioner is turned on.
  • Use ceiling fans. Moving air with ceiling fans can increase the comfort range.
 
 

Displaying blog entries 11-17 of 17

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Photo of DayBreak Group Real Estate
DayBreak Group
Keller Williams Realty
8250 White Oak, Suite 102
Rancho Cucamonga CA 91730
DayBreak Office: 909.945.0602
Giovanna Dunne: 909.224.7698
Fax: 866-306-8048