Let me give you a tip — you know your wife wants a new kitchen. Why do you think she watches HGTV? If you offer to replace one of those old, inefficient appliances with a new Energy Star appliance, without being prompted, I guarantee she will love it.
The average American home spends about $2,200 on energy costs every year, and there's only so much you can do with furnace filters and weatherstripping to keep costs down. When the time comes, smile and reach into your wallet for new, sexy, modern, efficient appliances. (If it helps, think about the $100 or more that you will be saving on your utility bills each year.)