Building　energy　consumption　could　benefit　from　air-to-air　energy　recovery　ventilators.　A　triple-loop　pump-driven　heat　pipe　system　was　developed　for　energy　recovery　from　exhaust　air　in　buildings.　The　thermal　performances　of　the　single-loop　and　triple-loop　systems　were　studied　and　compared　experimentally　under　winter　and　summer　conditions.　The　improvement　of　loop　number　and　the　uniformity　of　temperature　difference　distribution　was　discussed.　Results　indicated　that　heat　transfer　capacity　and　coefficient　of　performance　increased　with　indoor　and　outdoor　temperature　difference,　and　the　variation　of　temperature　effectiveness　depended　on　working　conditions.　The　energy　recovery　performance　of　the　triple-loop　system　was　better　than　the　single-loop　system.　The　heat　transfer　capacity,　temperature　effectiveness,　and　coefficient　of　performance　of　the　triple-loop　system　increased　by　3.0%,　0.6%,　and　56.7%　in　summer　conditions　with　an　indoor　and　outdoor　temperature　difference　of　7.5　degrees　C,　and　by　22.4%,　22.6%,　and　53.5%　in　winter　conditions　with　an　indoor　and　outdoor　temperature　difference　of　31.9　degrees　C.　The　uniformity　of　temperature　difference　distribution　could　be　improved　clearly　with　increasing　loop　number　in　winter　conditions　but　not　obviously　in　summer　conditions.　The　variation　coefficient　of　temperature　difference　decreased　from　17.2%　to　10.2%　in　winter　conditions,　and　from　4.5%　to　3.9%　in　summer　conditions.