Paul and Patricia Grogan, both 81, are selling their unique passive solar home near Dublin, Ireland for 1.275 million euros ($1.32 million) after living there for almost 50 years. The couple built the innovative energy-efficient house in 1976, featuring a fully glazed front that collects and retains heat from the sun.

The 4-bedroom, 2-bathroom home was designed to maximize natural light and views of the surrounding landscape. Its passive solar design was uncommon at the time but has proven effective, with the house achieving an energy rating on par with homes built since 2000.

"It was unusual at the time to have such a system, and it works pretty well," Paul Grogan said. "We do have to provide supplementary heat on very cold, wet days, though."

The property sits on over an acre of land about 30 minutes outside Dublin. Its glass front comprises windows and sliding doors that can be opened in summer for cooling. Surrounding trees provide shade on sunny days.

The Grogans spent about 35,000 Irish pounds to build the house in 1976. They raised their four daughters there and have many fond memories of the home and tight-knit neighborhood.

While sad to leave, the couple feels it's time to downsize to a smaller place closer to Dublin as they get older. They hope the buyer will appreciate the unique design and natural setting.

"There'll be a lot of tears when we leave this place," Paul Grogan said, reflecting on their decades in the home.

The listing highlights the property's sustainable design and proximity to Dublin, potentially appealing to remote workers seeking an energy-efficient home outside the city.