Energy efficiency upgrades can save money and cut back on carbon footprints. but how should much should we invest, especially during a pandemic? It’s been a big debate for N.H. utility regulators in recent weeks. As part of NHPR’s By Degrees climate reporting project, we unpack this issues and examine the pros and cons of greater efficiency. Should businesses and residents have to deal with up-front costs to create savings down the road? And what does this debate say about the state’s energy