Luke: Our heating bill is higher by about 25 percent this month. What's the deal?
Kylie: Well, there was a price increase. 
Luke: That can't be it entirely. There must be something else to make it so high.
Kylie: We have had more orders. More orders mean the dock doors are open for loading trucks. Open doors mean escaped heating?
Luke: True. How do we keep a lid on that?
Kylie: We should look into those flaps that go over the openings. You can still drive a fork truck through them but they seal off the outside air.
Luke: Brilliant! What do they cost?
Kylie: No idea until I check. But it has to be a cost savings.
Luke: We could also consolidate to only two shipments a day at the end of the day. Just use two companies.
Kylie: That would work. We would pay a bit more but save in the long run on energy, is that the idea?
Luke: Yes, but a cost comparison would be effective.
Kylie: I'm on it. I'll figure out what our savings is with each company.
Luke: That's great. Meanwhile, I'm going to shop energy companies I think!
Kylie: You may have missed the enrollment.
Luke: Oh, well, I'm still going to check. Won't hurt.
Kylie: Exactly.
Luke: If you think of anything else, let me know.
Kylie: Sure, no problem.
Luke: Thanks!
Their heating bill is higher by about 25%. Luke and Kylie suppose that the heat is escaping through dock doors when they are open for loading trucks. Kylie thinks they could bought some flaps to hang over the openings. Luke wants to consolidate to two shipments to save energy.