Ensure that nothing obstructs the A/C unit’s air intake around its sides, and air discharge off the top. Blocked intakes around the sides can severely impact the system’s performance, while also causing premature equipment failure. Use this guideline but note that some models may require larger setbacks to obstructions (refer to your owners/installation manual): Side A (to building): min. 6” Side B (to one side): min. 12” Side C (service side): min. 24” Side D (remaining side): min. 24” Air filter maintenance – Make sure that the furnace filter is replaced as per the manufacturer requirements. That means your typical 1” filters need to be replaced every 3 months and your thicker IAQ filters between 3 months and a year. You can call our FrontDesk for more information on your specific filter. Note that ALL Haven Installations include a hospital-grade MERV16 Air Filtration System that requires an annual filter replacement. Make sure that no lawn sprinklers directly hit your ac unit. Pay attention to any abnormal sounds during operation. Turn the unit off if it does not sound right to you! If your furnace is installed in the attic, ensure there is no water in the secondary protection pan (under evaporator) and check this at least once at the beginning of the A/C season after the unit has been operating for about 4 hours. Call us at (714) 332 – 6302 for more information.