Was your DS a heat pump? HP's rely on much higher air volumes than a LPG heat exchanger. Most users find large air volumes drafty.
As others noted insure the duct work is intact and adjusted correctly. There might also be different speed taps on the fan motor. Installers generally get less complaints using the slow speed, as it's quieter.
Be well.
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J & J, DRV Suites ES-38RSSA #9679 GM Denali, 3500HD-Max, 4x CC, 8' DRW,
EZGo-TXT, Clubcar Precedent
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