The paper discusses a study of particulate and organic emissions from unvented kerosene heaters in a test house. Results from the test house are compared with those from large (room size) chambers, using EPA's indoor air quality (IAQ) model. In the test house, unvented kerosene heater particulate emissions were collected on Teflon-coated glass fiber filters. Organic emissions were trapped on Tenax-GC and XAD-2 sorbents, and the organic compounds were identified by gas chromatography/mass spectrometry. Target compounds were then quantified. CO, CO2, and SO2 were monitored during each test. Weather data were also collected for correlation with emissions and house characterization data. The test house is a typical three-bedroom, two-bath, single-story frame house with crawl space. It has natural gas heat and electric central air conditioning. The house is 8 years old and has the energy efficiency features of homes built during the early 1980s.