Bottom line up front

Author: wlach

pages/environmental-impact.md

@@ -74,6 +74,8 @@ Note that we did not have solar installed for the full period of comparison (we
 
 Probably unsurprisingly, gas dominates the CO2 emissions in 2022-2023. Not just because it's vastly more emitting, but also because a good portion of the house's energy use came from it! After the heat pump and hot water heater installation, all of that heat gets converted to being generated via electricity, which we generate via either our solar system (zero marginal emissions) or the grid (negligible marginal emissions, as discussed above).
 
+### Emissions by month
+
 You can see this more clearly if you graph out our CO2 emissions by month:
 
 ```sql co2_by_month

pages/index.md

@@ -23,7 +23,16 @@ I had a few goals:
 1. Better understand the viability of household electrification in the future. We benefited from various government programs in our case (Greener homes grants and loans) but it looks like those are on their way out. Would this have made sense without them?
 
 In putting this together, I quickly realized there's just too many variables at play to provide definitive answers on these questions.
-Still, I felt by combining my own data with some credible public figures (e.g. the CO2 emissions associated with natural gas and electrical generation in Ontario) I could at least provide some information and analysis which might be interesting to someone contemplating something similar.
+Still, I felt by combining my own data with some credible public figures (e.g. the CO2 emissions associated with natural gas and electrical generation in Ontario) I could at least provide some information and analysis which might be interesting to
+someone contemplating something similar.
+
+Here's what I found:
+
+- [Heat pumps really do work in the winter](./electrification-and-solar#heat-pump) for a reasonably insulated house, even in -15°C. No backup required!
+- A natural gas furnace [emits a lot of carbon dioxide](./environmental-impact#emissions-by-month).
+- Even a relatively small (6kW) solar system can [produce a sizable amount of electricity](./energy#production).
+- The economics of both solar and heat pumps are [borderline without government support](./financials#time-to-break-even) - but not terrible.
+- Switching to time-of-use billing [made a huge difference for ROI](./financials#time-of-use-billing-game-changer) for our solar system.
 
 Please note this is not an academic study. Although I have made every effort to provide accurate data and thorough analysis, it has not been formally peer reviewed (although a few friends did give it a once over, thank you!).
 Any errors are my own.