How do I repair my air conditioning unit?

While some minor AC issues—like changing a clogged air filter or checking the thermostat settings—can be DIY fixes, most air conditioning problems should be handled by licensed professionals. Modern systems are complex, and attempting a repair without the right tools or training can make the problem worse or void your warranty. If your unit is blowing warm air, making strange noises, or won’t turn on, it’s best to schedule a diagnostic with an expert. At Mainstream Electric, Heating, Cooling, and Plumbing, our certified HVAC technicians can quickly identify the issue and recommend reliable, long-term solutions—so you’re not left sweating through another hot day.