How do you fix a leaking window air conditioner? Our wonderful old house was built in 1933 and we are trying to restore it to its original beauty. The house is two stories and has some issues, including the air conditioning system. The first floor has central air conditioning but the second floor has window air conditioner units which leak down the side of the house. Can I install drain lines on these units to run to the flower beds instead of the water running down the side of the house?