Hoot Heating & Air 51
https://gethootheatingairscope.capitaljays.com/posts/choosing-the-right-hvac-contractor-in-cecil-county
When my AC went out in the middle of a heatwave, Hoot Heating & Air had someone at my place within two hours. The technician was friendly, explained everything clearly, and didn't try to upsell me on stuff I didn't need. They fixed the problem fast and the price was fair. I've used them for maintenance ever since.