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In floor radiant is best way to go. Heats a room slowly is also a drawback. Unfortunetley, unless you want to rip up the existing concrete floor your stuck with a fan coil. If you are using a fired device be very sure you are ducting correctly otherwise you may be putting CO (Carbon Monoxide) into the room. Can,t see it, smell it, very deadly. Utilizing the homes existing boiler is a good option if enough capacity is available. Otherwise the home may cool a bit when the garage is pulled into the system.
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