What does your husband do for a living? Is he on the road driving around? (ie UPS driver, air condition repairman going from one house to the next)
If so, here's what I suggest. (This may sound odd, but my grandfather taught me this.)
Wrap a hot dog, or a pre-cooked hamburger patty (the kind that you just need to heat up) in aluminum foil. When he's about ready to eat, have him take the aluminum foil packet and stick it on the engine of the car. For hot dogs you only need to drive about 5 minutes. I have no idea how long for a hamburger patty, but I would guess about 7-10 minutes depending on if it's frozen.
You can do this with any foods really. I bought my grandpa a cookbook for engine cooking. He loved it, and one year he told my aunt that he would cook the turkey. He put it under the hood and drove the several hour trip to her house. It was done when he got there.