Yes, Its the middle of winter, but now would be a good time to get your AC ready for this spring. The vent on each side of the unit come off and the filter pops out. Clean with water and a sponge. Let them dry and then pop them back into place. You will be surprised how dirty they get. We clean ours every 3 months. They work so much better when the vents are clean.
If you are having issues with the unit, winter is the time to get it fixed, Get in touch with Thomas and see where he wants you to go to get the repairs done.