Carbon monoxide detectors ought to accompany new furnaces; however a small add-on

https://www.scribd.com/document/982336252/What-Is-the-Cost-of-a-New-Furnace-in-Ontario-in-2025-197735

Carbon monoxide detectors ought to accompany new furnaces; although a small add-on, they beautify safeguard and may be integrated in premium prices.