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Wham/wham design rescue

I have an office building with multiple office/exams rooms that needs some help. Basically, the primary air for multiple office/exam rooms/suites comes from rooftop lennox cooling only units and into each zone at about 63 degrees...the highest common denominator for comfort in multiple zones. Heating is provided by induct fancoils operated by Taco 572 zone valves and room t-stats. The rooms are small and the breeze is pretty heavy to satisfy some engineer/inspector. The net effect is that a given room gets 63 degree air which is too cold for naked people and the t-stat calls for heat opening the Taco valve dumping 180 degree water into the coil and providing 100 degree heating air, which almost instantly satisfies the room stat shutting down the fancoil. The rooms are obviously uncomfortable. Throttling valves and adjusting balancing valves has proven to be frustrating and ineffective. The owner needs to control the room temps +/- 1.5 degrees from setpoint to keep the tenants. I'm thinking that replaceing the Taco 572 with maybe a two port I-valve and sensing duct discharge temp allowing the valve to modulate might be the answer. Can I do that? I'm open for any suggestions. This is a working Dr. office so less mess/less time is a plus.

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