A fixed set kept at the summer house
Short answer: Keep one set of everyday clothes, two sets of bedding and four towels out there. Then only underwear and socks have to be packed each time.
What gives back the most time
Bedding and towels take up the most room in a bag and are the same whoever is going. If they live out there, packing becomes a bag rather than a suitcase.
What has to come each time
Underwear and socks have to come, because they are worn daily and have to fit. Everything else is better left out there. See bamboo underwear for men.
Storage between visits
Put the textiles in closed breathable boxes and keep them away from cold external walls. Wash everything through at the start of the season. See bamboo bedding and bamboo towels.
Frequently asked questions
Do textiles get damp in an unheated house
They can smell damp. Breathable boxes and an airing on arrival solve it.
What about guests
One extra set of bedding and two towels cover a weekend with visitors.
Should the clothes be washed after each visit
Yes, or take them home. Worn clothes left for six months will smell.