house-warmer
/ˈhaʊsˌwɔːmə/noun
1A person who attends a house-warming party.
2A party or other entertainment held to celebrate moving into a new home or premises.
3Something (especially an appliance) used to heat the interior of a house; a heater.
Origin
Late 17th century; earliest use found in Thomas D'Urfey (?1653–1723), playwright and writer. From house + warmer.