1. If PEX pipe has not yet been installed, one of the most effective ways to prevent freezing of water would be to run the tubing inside the interior walls rather than exterior.
2. Warm the rooms up a bit to keep the pipes in those rooms from freezing.
3. Insulate your PEX pipes. Insulated pipes resist freezing significantly more than the non-insulated ones.
4. Moving water takes longer to freeze than water that is not moving so allow water to flow from a sink through your plumbing system to keep the pipes from freezing. This option can be very effective, but costly as well. However, new innovative technology offered by the Hot Water Lobster Instant Hot Water Valve is easy to install (not requiring pipe cutting or electrical wiring) and a great pipe freezing prevention aid. Installed at the plumbing fixture at the end of the “at risk plumbing run” (pipes most likely to freeze), will allow water to flow from your water heater-through the existing hot water pipe in the “at risk plumbing run”-to the recirculation valve. From the recirculation valve the water will continue back to the water heater (for reheating)-through the cold water pipe in the “at risk plumbing run”. The system contains a sensor, which opens the valve only when the water temperature drops below the adjustable temperature setting. This open loop of water circulation keeps temped water circulating through the “at risk plumbing run” without wasting water while also providing faster hot water to all your fixtures.
5. Seal plumbing areas off from cold exterior air.