The present study was conducted for a comparative evaluation of wet and dry floor heating systems using geothermal heat pump. We circulated hot water from geothermal heat pump which is $10{sim}15^{circ}C$ lower than that from boiler. In order to access indoor temperature ($25^{circ}C$) it took 74 minutes for dry type and 247 minutes for wet type. Average floor temperature was $23.9^{circ}C$ for wet type and $32.7^{circ}C$ for dry type. Energy saving rate gradually increased by 66% after 138 minutes. As a result, in case of floor heating system using low temperature circulation water, dry type was more practicable for stable floor heating than wet type in terms of floor temperature and access time to indoor set temperature.