Matt shares one affordable trick for bringing fresh air into a tight modern house is to use an energy recovery ventilator (ERV). These units, like the Zehnder and Life Breath systems, provide filtered fresh air by exchanging heat and moisture between incoming and outgoing air streams. To enhance filtration and reduce the need for frequent filter changes, a pre-filter can be added to the system. This pre-filter helps capture larger particles, reducing the load on the main filters and ensuring cleaner indoor air. By implementing this cost-effective solution, homeowners can enjoy the benefits of fresh, filtered air without the high maintenance costs associated with frequent filter changes.