This thesis investigates the viability of using perimeter-only underfloor heating as an alternative to traditional full-surface radiant systems in residential buildings. The motivation comes from the well-known thermal comfort benefits of underfloor heating, which are often offset by higher installation costs and construction complexity. The central idea is to reduce the heated surface area by limiting it to the perimeter while still maintaining acceptable thermal comfort. A real house located in Furuvik, Gävle (Sweden) is used as the case study. The building was modeled in IDA ICE simulation software, with detailed inputs including envelope geometry, thermal properties, internal loads, and climate data. Two main heating configurations were simulated: one with full-floor underfloor heating, and one with perimeter-only heating. The perimeter configuration was tested at three widths (0.8 m, 1.0 m, and 1.2 m) to evaluate its impact on energy use and thermal comfort. Thermal comfort was studied using the PMV and PPD indicators and floor surface temperatures were analyzed by dividing the central space into five zones. The full-floor heating case consumed 19,019.2 kWh/year, while the 0.8 m perimeter case used only 15,835.1 kWh/year, representing an energy reduction of over 20%. However, this narrower perimeter also led to a significant drop in thermal comfort, with average PPD values exceeding 25%. Increasing the heated width to 1.0 m and 1.2 m improved comfort. Case with 1.2 m width offered a good balance of comfort levels and nearly matching full coverage, with moderate energy savings of 4.22%. Floor surface temperature analysis revealed that perimeter-only configurations did not cause lower temperatures in central zones. The maximum temperature difference between zones does not exceed 2 °C. A model validation was conducted by comparing simulated energy use with actual electricity bills from the building in 2024. The model overestimated energy use by 27%, largely due to the presence of a wood-burning fireplace in the real house, which was not included in the simulation. The study concludes that perimeter-only underfloor heating can be a viable and efficient solution under specific design conditions, particularly when energy reduction is prioritized. However, design adjustments such as increased heated width are necessary to ensure sufficient comfort, especially in colder climates like Sweden.