Air-to-water gives you options. This session shows which ones pay off—and which ones burn weekends. We’ll start with a fast review of common applications: in-floor radiant, fin-tube radiant, radiant + fan coils, straight fan coils, snow melt, and mini-chiller. For each, you’ll see where it shines, where it bites, and the cleanest piping diagrams and control strategies to keep comfort high and complaints low. Then we get into the choices that actually move the needle: 

• Integrating supplemental heat: when to add it, how to stage it, and how to stop it from fighting the heat pump. 

• Design trade-offs: emitter sizing, delta-T, and how water temperature decisions swing efficiency and capacity. 

• Controls & staging: outdoor reset that works, DHW priority without starving space heat, and simple overrides homeowners won’t hate.We’ll name the barriers to adoption—panel limits, permitting, stocking, inspector confusion—and give practical fixes for new construction and retrofits.

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We’ll close with “what’s next,” including a path to R290 readiness: tools, training, safety, and what changes (and doesn’t) on day one.You’ll leave with:  

• A simple decision tree sample to help pick the right architecture fast 

• Few field-tested piping/control templates 

• A short commissioning checklist sample aimed at the top causes of callbacks