The "To Keep Up" Wiki

This page is read only. You can view the source, but not change it. Ask your administrator if you think this is wrong.
~~NOCACHE~~ <fc #a0a0a0><fs small>//This page last changed ~~LASTMOD~~ visits: {{counter|today| time| times}} today, {{counter|yesterday| time| times}} yesterday, and {{counter|total| time total so far| total times}}//</fs></fc> 

=====Meeting Summary for Lex Computer Group's May 7, 2025 meeting=====

<fs xx-large>Heat Pumps in Lexington</fs> 

====Quick recap====
The meeting focused on various aspects of home heating and energy efficiency, including operational costs, retrofitting challenges, and the benefits of different heating systems. Discussions covered topics such as heat pumps, insulation, weatherization, and the importance of proper system design and installation. The meeting also touched on electrical considerations, ground source heating systems, and the potential for solar panels and battery power solutions in residential settings.

====Summary====

===Heat Pump Efficiency in Cold Climates===

Rich discussed the operational costs of heating systems, focusing on the cost to heat at each degree difference between inside and outside temperatures. He mentioned that electric resistance costs the most and that heat pumps are relatively cheap. Dan raised a question about the efficiency of air-sourced heat pumps in cold climates, specifically regarding condensation and freezing issues. Rich explained that modern systems use small heaters to clear condensation and that there have been improvements in material science to reduce condensation on coils. He also mentioned that during a defrost cycle, the system turns off the fans to minimize cold air back into the house.


===Retrofitting Older Homes With Efficient Systems===

Rich discussed the challenges and potential solutions for retrofitting older homes with efficient heating and cooling systems. He emphasized the importance of proper design and installation, highlighting the need for a good heat load calculation and matching the right system to the house. Rich also mentioned the potential for dual fuel systems and the importance of considering cost and incentives. He expressed interest in understanding who are the good installers and how to make decisions about these systems.


===Heating System Discussion and Weatherization===

Rich discussed the benefits and drawbacks of different heating systems, emphasizing the importance of weatherization in maintaining a comfortable temperature. He suggested that radiant heating is more comfortable than forced hot air systems, but noted that it can be drier. Rich also highlighted the need for accurate heat load calculations before replacing a heating system. He recommended starting with weatherization, including insulation and air sealing, before considering upgrades to windows or heating systems. Judy added that air sealing around windows can significantly reduce energy loss.


===Insulation, Energy Efficiency, and Indoor Allergens===

The attendees discussed various aspects of home insulation and energy efficiency. They agreed that while insulation is important, it's not the only factor to consider. They discussed the benefits of passive systems, such as awnings and heavy drapes, which can save energy. They also talked about the potential of heat pumps and the importance of proper air sealing. However, they acknowledged that these measures can increase indoor allergen levels and Radon levels. They concluded that while a leaky house may not be ideal, it can help address these issues. They also touched on the topic of electrical panel upgrades, but did not reach a conclusion.


===Heat Pump Feasibility and Installation Costs===

Rich discussed the feasibility of running heat pumps in a 2,000 square foot house, noting that the load is less than 50 amps at peak and 20 amps for a 3-ton unit. He emphasized the importance of smart panels to prevent overloading the main electrical system. Rich also shared his personal experience with energy monitoring at his house, which has solar panels and a heat pump. He explained that even with the heat pump or air conditioner installed, he doesn't exceed 7 or 8 kilowatts of usage at any given time. Rich also mentioned that a 100-amp service can handle up to 20 kilowatts of draw before getting into trouble. He highlighted the trade-offs of using heat pump water heaters, such as the need for space and the potential for colder and drier basements. Rich also discussed the current policy of ripping out old systems for whole house conversions and the potential for higher installation costs. He concluded by mentioning the possibility of ground source heat pumps and their efficiency compared to air source heat pumps.


===Ground Source Heating System Challenges===

Rich discussed the advantages and challenges of ground source heating systems, including the need for drilling and the potential for high costs. He also mentioned the importance of considering the soil conditions in Lexington. Ted raised concerns about the ownership of groundwater and the potential for power line issues in Lexington.  Rich also discussed the importance of considering the power requirements for heating systems and the potential for battery power solutions. The conversation ended with a discussion about the challenges of implementing solar panels and the need for better tools to make the process easier for homeowners.