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Building HVAC Science

Mar 6, 2020


“The only think I have learnt over the years is that if you enjoy your work and put in best efforts it will show. If you follow this process, things work out. But if you go chasing a formula, success will elude you.”

Mahesh Babu

While building his own house, John Semmelhack’s innate curiosity grew as he researched the best was to design and build a home.


This lead him to start his own business, Think Little.


The name of his business is deceptive as John is truly a big thinker, who acts in quiet ways to create comfortable, energy efficient and durable homes that have excellent indoor air quality.


Lend us your ears to learn how following simple, yet important processes lead to amazing results. 


We discuss HVAC Air filtration and why and how to get super-inexpensive, extremely effective filtration 


He employs test and measurement at every appropriate juncture as well as post work, continuous monitoring for IAQ, energy and comfort. These factors are easier to measure than ever before! 


John also reviews aspects of running this type of business including the variety of services he has developed over the years.



John Semmelhack is the owner of Think Little ( and co-owner of Comparetto Comfort Solutions, a pair of home performance consulting and contracting firms based in Charlottesville and Richmond, Virginia. Think Little specializes in building enclosure and mechanical system design and commissioning for single-family and multi-family Passive House and zero-net-energy homes in the mid-Atlantic. Comparetto Comfort Solutions focuses on high performance HVAC installations for new homes in the Charlottesville and Richmond markets, as well as home performance contracting to help meet clients’ comfort, indoor air quality, durability and energy efficiency goals.