I think houses often have air to air heat exchangers. They suck in air from the outside, and through the power of physics somehow warm it up or cool it down to

I think houses often have air to air heat exchangers. They suck in air from the outside, and through the power of physics somehow warm it up or cool it down to match the room temperature. Found this while searching: https://www.ag.ndsu.edu/publications/energy/air-to-air-heat-exchangers-for-healthier-energy-efficient-homes https://www.ag.ndsu.edu/publications/energy/air-to-air-heat-...