A blockage in the filter caused by dust or dirt can limit the amount of cool air passing through. When your air conditioner is not keeping the temperature cool or is blowing warm air, the first thing to investigate is the AC filter. In cases where a dirty filter is not causing the issue, it may be best to contact an experienced HVAC technician for further inspection and maintenance. At Pioneers Heating and Air, We use top-of-the-line products, and our services come at reasonable costs to ensure that HVAC repair service is not a significant burden on your wallet. Call us at (626) 217-0559 to arrange a no-cost consultation!