Energiesparhaus. at is an Austrian online community focused on energy-efficient living, home construction, renovation, and household energy use. Its central feature is a discussion forum where members share questions, practical experience, and recommendations on projects ranging from planning and financing a home to improving insulation and choosing building materials.

Topics cover the building envelope, including windows, airtightness, passive houses, prefabricated homes, and mould, as well as heating, ventilation, hot water, solar thermal systems, photovoltaics, electricity use, and energy calculations. The site also provides foundational information, purchasing advice, product recommendations, and a searchable collection of discussions. Current forum conversations address real-world issues such as heat pumps, solar batteries, underfloor heating, ventilation, roof insulation, and home automation.

Energiesparhaus. at additionally connects visitors with comparison services, including offers for photovoltaic systems in Austria and Germany, Austrian electricity providers, and home financing. It presents itself as a resource for people planning, building, or renovating homes and seeking community knowledge and practical guidance on energy-conscious decisions