Because Lanzarote tends to be sometimes cold in the evenings can someone point me in the right direction too a good hotel with heating in the rooms.
Age 77 need the comforts!
14 deg C at night is just the average temp, so it looks like you were unlucky and went when there was a cold spell.
In answer to your original question, I can't help you soz :(
San Antonio, Puerto Del Carmen, It is a great hotel right on the beach we went in May and November and weather was great naturally there will be breeze as you are on the Atlantic, bring a jacket for evening but hotel rooms warm and extra blankets available just have a nice warm night cap in the bar before bed.