View all items > Air Conditioners & Accessories at True Value Cool things down and beat the dog days of summer with a new air conditioner unit from True Value. Whether you're looking for a new window-mounted air conditioner, or if portable air conditioners better fit your needs, you'll find what you're looking for at True Value. The air conditioners we carry are designed to work in many different settings, so be sure to browse our full selection and find the one that best suits your situation. Spending too much on your energy bill can have a big impact on your household finances. Energy Star air conditioners combine high quality cooling mechanisms with the latest in energy efficient design for an effective cooling solution at a price that won't overheat your budget. We also offer air conditioning accessories to help you properly care for and maintain the life of your new air conditioner. To control air flows, make sure the is continuous An air barrier helps control airflow both through and within the building enclosure.

By controlling airflow, you also control moisture. If moist indoor air contacts a cold surface — for example, exterior sheathingMaterial, usually plywood or oriented strand board (OSB), but sometimes wooden boards, installed on the exterior of wall studs, rafters, or roof trusses; portable ac unit usedsiding or roofing installed on the sheathing—sometimes over strapping to create a rainscreen.ac unit running but no air in cold weather — condensation can result. central air conditioner unit fansAn air barrier prevents those cold surfaces from being connected with humid indoor air. Air has a maximum storage capacity for water vapor which depends on temperature. Warm air can store lots of moisture, while cold air can store very little.

According to Straube, as the temperature falls from 90°F down to 20°F, the amount of moisture that can be stored in the air changes by a factor of ten. “This is like a gas tank that shrinks as the temperature gets colder,” he says. “When it’s hot, you can store a lot in this tank, but when it’s cold you can’t store much at all. And if you were to have a large gas tank filled with gas and you shrunk it, eventually it would spill over. 1. Air Leaks Waste Energy 5. Humidity & Mold Leaky homes didn’t have condensation problems Older buildings rarely had condensation problems in cold weather because they were so well ventilated — meaning leaky. The relative humidity in an old home would rarely rise above 25%. As we have built tighter houses (and in some cases failed to provide mechanical ventilation), the indoor relative humidity has gone up. In a heated, tight, unventilated house, the amount of moisture in the air and the amount of condensation that can occur are dramatically different than in an old leaky house.

Condensation can occur wherever water vapor can find a cold spot — on roof or wall sheathing, on the inside faces of the windows, and inside the walls. Let's say it’s 40°F outside and the outdoor relative humidity is 50%. If you allow that outdoor air to enter a building and heat it up to 70°F, the amount of moisture in the air stays exactly the same, but the “tank” gets bigger because the storage capacity of the air increases with the temperature. As a result, the relative humidity initially drops. Then, as moisture is added to the air, the relative humidity rises, and the absolute moisture content rises as well. How do you add moisture to the air? You breathe, sweat, boil water for spaghetti, take hot showers, grow houseplants — and all of those activities generate moisture. When does indoor humidity become a problem? Let’s say that air leaks out of a house through holes in the enclosure. As it reaches surfaces colder than 52°F or 53°F, the air will cool.

Once it reaches its full capacity to store moisture, condensation occurs. Airtight Wall and Roof Sheathing One Air Barrier or Two? Pinpointing Leaks With a Fog Machine How to Use the Psychrometric Chart Rating Windows for Condensation Resistance All About Wall Rot If the temperature of the outdoor air is around 30°F, the indoor air will drop all of the moisture that it gained on the way out, dumping it on the cold sheathing surface. That’s a typical example of the air leakage condensation cycle. Since condensation in walls can cause puddles — and in extreme cases, rot the framing — condensation is something you want to avoid. Installing an air barrier is one way to help prevent condensation. Air conditioning can also create condensing surfaces The same phenomenon can happen in reverse in the summertime. Let’s say the outdoor air is 85°F and the relative humidity is 75%. When outdoor air leaking inward contacts a surface below about 76°F, the moisture in the air will condense.

So if you have an exhaust fan in your home, the air leaking in may cause condensation on the air-conditioned surfaces — for example, on the back side of vinylCommon term for polyvinyl chloride (PVC). In chemistry, vinyl refers to a carbon-and-hydrogen group (H2C=CH–) that attaches to another functional group, such as chlorine (vinyl chloride) or acetate (vinyl acetate). If moist air leaks into a house through gaps in the wall or roof, you can have problems. But in a tight house with a good air barrier and a supply-only ventilation system, most of the air that’s drawn inside is drawn in through the air conditioner, so the first cold surfaces it sees are the cooling coils. If you have air leaks in your building envelopeExterior components of a house that provide protection from colder (and warmer) outdoor temperatures and precipitation; includes the house foundation, framed exterior walls, roof or ceiling, and insulation, and air sealing materials., you usually can’t see the condensation — unless you’re a forensic engineer like Straube, who goes around cutting holes in walls.