Some people just want to customize everything. So, is it OK to paint a MRCOOL DIY air handler from the MRCOOL DIY Ductless Mini Split System? Video Script: Steve wants to know: "Hey Dan, can I paint my MRCOOL DIY Ductless Mini Split Air Handler to match the inside wall color?" Yes, you could do that. You just want to make sure none of the paint gets on the inside mechanisms, the coil, or the air filter because that will make the unit run inefficiently and could potentially damage the system. Have more questions? Just ask them in the comments below or on Facebook or on Twitter.