I’ve got a cordless pet hair Shark, which is really efficient for everyday cleaning - I’ve also got an old corded Miele, which is heavy to use, but as Foxyferret said, very powerful and would suck the carpet off the floor on full power, but unfortunately they have stopped making the very strong power ones now - not sure why, but they do use a lot of electricity. Cordless vacuums actually use less electricity than using a corded vacuum, if that is a concern. Corded vacuums draw power heavily directly from the outlet while in use, whereas cordless vacuums use a trickle charge to top up, and have battery management systems that prevent overcharging even if you leave them switched on when the battery is fully charged.