I’m not schooled in physics, but it is my understanding that heat will not travel through a vacuum, as there are no molecules to bounce into each other. Space is pretty much a perfect vacuum, isn’t it? So, how do we get heat from the sun? If sound won’t travel through space, why does heat?
Please explain in layman’s terms if possible… 
You have answered your own question. Heat will travel through vacuum in the form of radiation.
As sailor has said. Photons, my friend, Photons
And what the thing with vacuum cleaners? If it’s a vacuum, there’s neither anything there to clean nor any dirt to clean off the non-existant thing in the vacuum.
Heat can move in three basic ways:
[ul][li]Conduction - a hot thing touches a cooler thing, and the cooler thing warms up. This is easily understandable in terms of molecules bonking each other.[/li][li]Convection - hot things move from place to place, for example a hot air balloon. This is just a hot thing moving around - no mystery here.[/li][li]Radiation - all things emit radiation based on how hot they are, and absorb radiation as well. If you have a hotter body near a cooler body, the cooler body will absorb radiation from the hotter body and warm up.[/ul][/li]
You can sometimes feel radiation when you are near a hot fire or stove - I feel it on my cheeks, and I can readily block it with my hand.