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We present Herschel observations of 62 Early-Type Galaxies (ETGs), including39 galaxies morphologically classified as S0+S0a and 23 galaxies classified asellipticals using SPIRE at 250, 350 and 500 microns (and PACS 100 and 160microns for 19 sources) as part of the volume-limited Herschel ReferenceSurvey. We detect dust emission in 24% of the ellipticals and 62% of the S0s.The mean temperature of the dust is 23.9+/-0.8 K, warmer than that found forlate-type galaxies in the Virgo Cluster. Including the non-detections, the meandust mass is log(Mdust) = 5.9+/-0.1 and 5.2+/-0.1 Msun for the S0s andelliptical galaxies respectively. The mean dust-to-stellar mass islog(Mdust/Mstar) = -4.4+/-0.1 (S0s) and -5.8+/-0.1 (ellipticals). Virtually allthe galaxies lie close to the red sequence yet the large number of detectionsof cool dust, the gas-to-dust ratios and the ratios of far-infrared to radioemission all suggest that many ETGs contain a cool interstellar medium similarto that in late-type galaxies. The mean dust-to-stellar mass ratio for S0s isapproximatly a factor of ten less than for early-type spirals and the sizes ofthe dust sources in the S0s are also much smaller. We show that the differencecannot be explained by either the different bulge-to-disk ratios orenvironmental effects such as ram-pressure stripping. The wide range in thedust-to-stellar mass ratio for ETGs and the lack of a correlation between dustmass and optical luminosity suggest that much of the dust in the ETGs detectedby Herschel has been acquired as the result of gravitational interactions;these interactions are unlikely to have had a major effect on the stellarmasses of the ETGs. The Herschel observations tentatively suggest that in themost massive ETGs, the mass of the interstellar medium is unconnected to theevolution of the stellar populations.

The Herschel Reference Survey: Dust in Early-Type Galaxies and Across the Hubble Sequence