Vent warm humid air into your house from the dryer. Don't send your nice heated air outside. When it warms up outside, quickly configure the lint trap to vent to the outdoors and save your air conditioning.
Step 1: Cut the Holes
Cut 3 vent holes in the lid of a 5 gallon bucket. I am using a 4" can as a template, so that I will ensure a snug fit.
Diameter of the first 2 holes is slightly over 4" to accept the 4" dryer vent hose. (A jigsaw cuts the best, a drywall jab saw wants to get stuck. I used a utility knife. Scary!...but the cut was great.) The third hole is a half inch bigger (4 1/2" diameter) so I can use the scrap as a cover for the unused vent hole. I am using cans that just happen to be the right 4" size. The cans will be used later to stiffen up the ends of the dryer hose.