House is an induction coil. It is generation 3 of pi-heptomino and part of two of the three blinker fuses for offset 4. It is produced by both slow puffer 1 and slow puffer 2 (latter produces a pi heptomino that becomes a house, then a p18 house-based fuse).
It can also be seen as a cis version of the integral sign.
Due to the eater-like caps, it can be used as a glider eater when stable, although it can only set two at once and they both must collide at the exact same time.