Can you use a mattress pad without a mattress?

You can. It just won't be as well cushioned.

It is not recommended to use an electric mattress pad with a memory foam mattress or topper.

yes all you have to do is blow up the matress and put the heated pad on it.

If you are referring to a mattress protector or a cover, there should be no problem as this will help prolong the life of your mattress and the mattress topper. A mattress "pad" and a "topper" are...

Yes, but it will sleep hot! Having a pad over a good memory foam mattress defeats the purpose of buying a good mattress set. You can use a mattress protector that has been specially made to dissipate...