Attic ventilation fans
Times are tough, saving energy means saving money. Here's what you do to help yourself!

Lower electric summer bills,attic exhaust fans work

What you want is to get the attic air temperature as close to the outside temperature as possible.

How does attic ventilation improve energy efficiency? When the sun heats a roof, it's primarily the sun's radiant energy that makes the roof hot. A large portion of this heat travels by conduction through the roofing materials to the attic side of the roof. The hot roof material then radiates its gained heat energy onto the cooler attic surfaces, including the air ducts and the attic floor.

A good rule of thumb is less than 100 degrees. A poorly ventilated attic can have temperatures that reach above 160 degrees. Even an attic with a convection fed system (ridge and soffit vents) can reach between 140 and 150 degrees. When an attic temperature gets above 100 degrees the heat is drawn toward the living space through the insulation and has a detrimental effect on the air handler and duct work in the attic. A powerful ventilation system along with the proper intake air is capable of keeping your attic around 100 degrees on a 90 degree day.

Why is the upstairs harder to cool than the downstairs?

Typically the HVAC air handler and ductwork for the upper floor(s) is located in the attic. The heat trapped in the attic is being absorbed into the duct work and the air handler. By the time the cold air is produced in the metal air handler and the air runs through the ductwork it can be heated between 8 and 20 degrees because of the extremely hot air in the attic. When the temperature in the attic is lowered the air conditioning unit runs more efficiently to produce cooler air.

A: Ventilation promotes a cooler attic in the summer and a drier attic in the winter. By exhausting heated air from the attic, a good ventilation system will help keep the rest of the house cooler with less energy usage. In cold months, ventilation prevents moisture build-up in the attic. As warm, moist air rises into a cold attic, it can condense under the roof deck, causing the decking and shingles to distort and deteriorate. Excessive heat and excessive moisture can both lead to serious roof damage.

Q: Where does that moisture come from?

A: It comes from normal household activities, such as showers, laundering and cooking activities that can release as much as three to five gallons of water vapor a day. If this water vapor becomes trapped in the attic, it can cause roof decking and shingles to warp and distort. Lack of appropriate ventilation can void your home warranty.

Too often, attic ventilation is overlooked, not to mention ignored as a place for energy savings. That’s where powered attic ventilators make sense.

Consider this: air trapped in your attic can easily reach 150° or more. With powered attic ventilators solutions, it’s still a full 60° cooler in the attic on a 90° day. That’s why attic ventilation is critical to making any home more comfortable while lowering energy costs.
Air-conditioners can run less and won’t have to work as hard. Humid, stagnant air can be removed, drawing fresh dry air across the surfaces.

Your attic can be drier and cooler – the perfect tools to help fight potential moisture damage.


Why do I see streaks on relatively new roofs?

When a shingle is overheated “burn-off” occurs. This occurs when a shingle over heats and the top layer breaks loose and falls off. The top layer of the shingle has a protective coating which prevents algae build-up. When that coating comes off mold and fungus can grow on your roof. When the attic is kept at a cooler temperature the “burn-off” effect is minimized. This in turn keeps your roof looking better longer and the rate of deterioration is much slower.

email james@besld.net

Times are tough! Saving energy means saving money. Here's what you do to help yourself;

Ridge vents are very attractive, easy to install and makes all the sense in the world...they just don't work. Everyone will agree hot air rises. Where best to put an attic exhaust vent? At the peak where the attic air is the hottest?
Sounds logical except for one basic fact: Hot air rises, it doesn't go down. A ridge vent design dictates hot air must fight gravity, travel down from the peak of the roof in order to escape. This of course is unrealistic and so is expecting this type of vent to be effective. The only "driving force" that makes hot air leave an attic is the differential density of the 140F attic compared to the more dense ambient outside air. If you have any doubts (as we did), as to the function of this type of vent, do what we did: Buy a 2000 CF smoke canister, place it in a coffee can in the center of the attic and light it. Then go outside and wait for the smoke to come out of the ridge vent. Better bring a lunch, plenty of water and a good book....you will be there awhile.
I’ve worked in attics for 30 + years. When I look up and see a ridge vent I know that it is going to be a bad day. I try to talk to the home owner about attic ventilation.  I have not changed one customers mind!  They think it does its job, and they say, “We would just like some ceiling fans”. Don’t get me wrong, I love ceiling fans.

Ceiling Fans

 A must for Summer Season - You would find that during summer season the use of a fan increases drastically as it helps in surface cooling by wind motion. But I go into a lot of homes that the home owner just does not use the ceiling fans.

Why is the upstairs harder to cool than the downstairs?

Typically the HVAC air handler and ductwork for the upper floor(s) is located in the attic. The heat trapped in the attic is being absorbed into the duct work and the air handler. By the time the cold air is produced in the metal air handler and the air runs through the ductwork it can be heated between 8 and 20 degrees because of the extremely hot air in the attic. When the temperature in the attic is lowered the air conditioning unit runs more efficiently to produce cooler air.

Power Fans:

STAY AWAY FROM UNDER POWERED SOLAR ATTIC FANS, THEY JUST DON'T MOVE ENOUGH VOLUME. Great idea, not enough power.

WHIRLYBIRDS

The correct term is "air motor", also called roof turbines. It is thought that the spinning turbine creates some sort of suction which induces air movement. This has not been proven.

 

Let's start with an understanding of basic physics: Hot air rises. But why? Heated air rises due to a differential in density (mass), which causes an upward movement of the fluid (air is a fluid). Like a lava lamp, the colored liquid is heated, rises to the top, cools off (density is increased), then falls back to the bottom.

Think of the force required to raise a hot air balloon off the ground with 10 passengers, the tanks of propane, the weight of the basket and the balloon. Pretty impressive force if you think about it. Should be easy for hot air to rise out of your attic right? Driven by the density differential, the exhausting of the hot air should bring in fresh air where vents are located around the base of the roof (soffit).

There is no "pressure" that drives hot air out of an attic. The pressure (atmospheric), inside your attic is the same as it is outside (based on a no wind condition). Wind blown across a roof can create a positive pressure on the windward side and a lower pressure on the lee side. Only the differential buoyancy of heated air over the temperature of ambient air is different.

Briggs electrical service provides residential, commercial and industrial electrical services.

Located in Matthews North Carolina between hwy 74 hwy and 485 to easily provide Electrical Service in Matthews North Carolina and Electrical Service Charlotte North Carolina and Electrical Service Union County, Weddington, Wesley Chapel, Waxhaw North Carolina

  Briggs Electrical Service & Lighting Design.

500 East Matthews Street Matthews, NC 28105

Phone number (704) 847-5737  

Fax number (704) 972-0532.
 

The owner Peter James Briggs

Email james@besld.net

Office manager Trinity Reynolds 

trinity@besld.net

Main website http://www.besld.net  80 pages        2nd website http://www.besld.com  19 pages

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