Now that the weather is getting nicer it's a good time to inspect the outdoor part of your unit and clear away any debris that may have rested there in our recent storms. Remember: Experts recommend that you have your HVAC system professionally inspected every fall and spring.
You should also be replacing your air filter every 90 days. So if you've not replaced yet this year, you should add that to your to-do list for the first week of April. Not sure what size filter you need? Check your home inspection report, or do what I do: sneak a peak at the one currently in the unit and snap a quick photo of the size with your phone so you have it handy when you get to the hardware store.