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Charles Smith with Heating & Air Solutions hooks up to test the coolant line pressure on a condenser unit Thursday at a home in Springdale. Proper refrigerant pressure is essential for a central air system to work properly. Smith has several easy tips to prolong the life of an air conditioner until including keeping grass and shrubs at least three feet away from the outside unit and when mowing, to always mow away from the unit to keep the mower from blowing clippings into the unit.