The price of used window air conditioners can vary depending on factors such as brand, condition, age, features, and the local market demand. However, to give you a general idea, here's a rough estimate of what you might consider asking for your used units:
Kenmore 12000 BTU: Since it has a higher cooling capacity, you could ask for a higher price. Considering that it is used and assuming it's in good working condition, a reasonable price range could be somewhere between $100 to $200.
Sharp 6200 BTU: This unit has a slightly lower cooling capacity, so you may want to adjust the price accordingly. Again, assuming it's in good working condition, you could consider asking for a price range of $50 to $100.
Keep in mind that these are just approximate figures, and the actual price you can fetch for your air conditioners may depend on factors specific to your local market, the condition of the units, and the demand for used appliances in your area. It's always a good idea to research similar listings in your local market to get a better sense of the going rates and adjust your pricing accordingly.