Use Natural Ventilation
Heat accumulates in your building during the day, and the cool night air can flush it out. Natural ventilation relies on the wind and the "chimney effect" to keep a building cool. Depending on the building design and wind direction, a windbreak - like a fence, hedge, or row of trees that blocks the wind - can force air either into or away from nearby windows. Wind moving along a wall creates a low-pressure zone that pulls air out of the windows.
The chimney effect occurs when cool air enters a building on the first floor or basement, absorbs heat in the room, rises, and exits through upstairs windows. This creates lower air pressure, which pulls more air in through lower-level windows.
Use Windows and Doors for Cross-Ventilation
You can create natural cross-ventilation by opening your windows and doors, and adjusting the size and location of the openings to ventilate different parts of the building. Inlets and outlets located directly opposite each other cool only those areas in between, in the direct path of the airflow. You'll cool more of your home or business if you force the air to take a longer path between the inlet and outlet.
Experiment with different patterns of window venting to move fresh outside air through all of the rooms in your home or business. This may involve leaving some windows closed if they interfere with air moving along a longer path.
Solar heat travels in through the roof and radiates into the attic. Attic ventilation reduces attic temperature 10° to 25° F and slows the transfer of heat into the living space. However, the most effective way to reduce attic heat is to block the heat from entering in the first place with a reflective roof and at least a foot of attic insulation.
The best way to ventilate an attic is with natural ventilation. You need about one square foot of opening for every one hundred square feet of ceiling area. The vents should be split equally between the rooftop and the soffits. A fan is another alternative but requires electricity to operate.
Air Conditioners account for a large part of summer energy budgets, from central air to ductless to window units. Older systems don't offer the same energy benefits that modern systems can achieve. Systems that are 7 years or older should be upgraded. Air filters are found on all kinds of air conditioners, dirty filters block the flow of air that is necessary to circulate the outside air through the system to the home. Air filters should be replaced every month during heavy usage in the summer or cleaned to prevent overworking the system. Compressors that are stored outside for central air units and mini-split systems should be inspected and cleaned regularly.