You could install one of these:
https://www.gil-lec.co.uk/vent-axia-12v-selv-tempra-heat-recovery-ventilator-unit-timer-444369
12v MVHR, it would bring warm dry air in and prevent condensation in winter, or just fresh air in summer.
@M_A_X started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
You could install one of these:
https://www.gil-lec.co.uk/vent-axia-12v-selv-tempra-heat-recovery-ventilator-unit-timer-444369
12v MVHR, it would bring warm dry air in and prevent condensation in winter, or just fresh air in summer.