Especially if you live in a hot climate, old air conditioners will probably cost you more than they save. Newer units have much higher efficiencies.
Old units wear out and cool poorly for the same power cost. A replacement may be expensive at first, but it will likely pay for itself.
Check the seal on your oven door. Gaps or tears in the seal will let heat escape and waste energy.
Protect against drafts around windows and doors by caulking and weather stripping.
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