Manual S Deep Dive: Selecting HVAC Equipment Based on Manual J Load Calcs- Part 2 of 2

Picking up where we left off in Part 1 (https://youtu.be/LEKEMI05dJE), Alex Meaney shows a design where a 3.5 ton, a 4 ton, and a 5 ton air conditioner all match a Manual J load, and explores the fine points of practical applications of the 3 rules of Manual S: 1. Select equipment that can handle 100% of the humidity load (latent heat) at minimum 2. Select equipment that does not exceed cooling load by too much (15% for single stage equip, 20% for 2-stage, 30% for variable capacity) 3. Select equipment that does not exceed total capacity by too much (but this rule must be broken in some cases)

Check out Alex Meaney's trainings: https://MeanHVAC.com

Watch Matt Risinger's video on the Build Show about my Manual J report tour: https://www.youtube.com/watch?v=CL-_VjlYnD0

Manual J Deep Dive (and Selecting HVAC Equipment with Manual S)- Part 1 of 2

Alex Meaney is my trainer when I level up on HVAC design calculations, and he came to visit us and share some of his expertise. Alex reveals what the J stands for and why you should never round up the tonnage from your Manual J software, and gives two rules for Manual S: 1. Never use AHRI data 2. Meet the latent load while not going too far over the sensible load (more in part 2) Check out Alex Meaney's trainings: https://MeanHVAC.com Watch Matt Risinger's video on the Build Show about my Manual J report tour: https://www.youtube.com/watch?v=CL-_VjlYnD0 Learn more about the Science of Homes: https://BuildingPerformanceWorkshop.com Watch the first-ever TV series about the Science of Homes: https://HomeDiagnosis.tv

Where Best to Put Ventilation Intakes? ERV, HRV, Supply and Intermittent Exhaust Vent Terminals

The maintenance of homes just doesn't stop, whether it's a high performance home or not. There are too many variables between family behaviors, between homes, between neighborhoods and climates that you just can't predict everything. Tweaks must be made. Here's a quick demonstration of HOW and WHY to clean the ERV or HRV outside ventilation terminals, as well as a quick modification of the insect screen on these 8" round duct hoods.

More on this home at: https://homediagnosis.tv/atlanta-homestead

How Many CFM Does My Home Need? Ventilation Advice from HVAC Researcher Jeff Siegel

Spoiler alert: Corbett's wearing a retainer. Yes. You don't have to comment about it. Video forthcoming, as a matter of fact. Jeff Siegel is a superstar of HVAC research, and you can learn more from him in his original interview with me and at his research site. We're in the University of Toronto's rooftop climate chamber, shooting the bull about how many air cleanings per hour (aka air changes per hour, which is confusing to blower door folk) we should aim for in our living spaces. Learn more about specific ventilation strategies at:

https://Broan-Nutone.com

https://AirCycler.com

https://Renewaire.com

https://HVI.org

Automatic Ventilation Control with Broan-Nutone's Overture: Customizable, Modular Fresh Air System

Places are different, homes are different, families are different. There IS NO SINGLE SOLUTION for ventilation, and that's the way it's likely to stay- so the more modular, customizable components we have access to, the better.

In addition to having some of the most advanced ERVs in the world (stay tuned for more on that), Broan has now made customized, modular ventilation systems much more practical with this lineup of Overture controls: room sensor, wall control, and smart plug- all linked to the algorithms in an app.

The Overture system can control exhaust fans, supply fans, make up air dampers, and ERVs/HRVs- we hope they will continue to push forward into controlling air handlers, dehumidifiers, humidifiers, and more. Learn more about this system and start brainstorming what you might do with it at: https://Overture.Broan-Nutone.com

Learn more about our TinyLab: https://www.youtube.com/playlist?list=PLsc2-5fAgMq51-6Gwm3m7HXjRhgt9X7RK

Watch the build of our Forever Home: https://www.youtube.com/playlist?list=PLsc2-5fAgMq4YgAoFaG-F6xvGT1MKwt-u

See the first-ever TV series about the Science of Homes: https://HomeDiagnosis.tv

Filterless Air Cleaners Make No Sense: Airfree Lotus Air Purifier

Honestly, it's starting to piss us off that some of these marketing teams are combining their shocking lack of understanding of what they're selling, with an assumption that their customers won't be able to understand it either. Let's fix that right now, starting with this Airfree Lotus 'filterless air purifier'. Oh, and they make one specifically for baby rooms too, if this wasn't dumb enough already.

If you need cleaner air, use good filters, or dilute with outdoor air using something as simple and affordable as an AirCycler: https://www.aircycler.com/

Join our team and be part of our work! https://Patreon.com/HomeDiagnosisTV

Bath Fan and Duct Inspection Tips for Restoration After a House Fire

Our friend Shawn had a fire disaster last year, and though it’s a terrible loss he’s helping us and our audience learn from the experience. Here’s a quick preview of what will be coming in Season 3 of Home Diagnosis. Here we point out two things to watch out for- one good, one bad. Easy to inspect a construction site if you know how things are supposed to work! And Shawn’s awesome fitness hammers can be seen at: https://bamfhammer.com/

Mythbusting a Miracle Cooling Machine: Basically a Sped Up Sweat Box- Arctic Air Pure Chill Review

This 'Arctic Air' Pure Chill machine is trying to sell itself as an air conditioner, but it's actually a cleverly disguised evaporative humidifier, like you'd use in an old house in wintertime. Ridiculous. Here's a bit of testing and science fundamentals to help you avoid re-branding and other marketing tricks in your home. For the testing, I used the temperature/humidity datalogger HOBO MX1101.

Whole Home Depressurization: Worst Case 'Thanksgiving Day' Scenario for Pressure Imbalances

From 'Home Diagnosis' Season 2 ep7: It's important to test how much suction your home can create with the machines and duct systems built into it- is it sucking hard enough to create unhealthy contaminant or moisture problems for your family? Here's a quick look at the 'Thanksgiving Day scenario' we worry about in homes new and old. See this entire episode: https://homediagnosis.tv/episode-207-slow-burn

Join our Patreon team and be part of our exploration of the Science of Homes: https://www.patreon.com/HomeDiagnosisTV

Our DIY Forever Home Build: Testing Blower Door, Infrared, HVAC, Pressure Imbalances

From ‘Home Diagnosis’ Season 2 ep13: See what comprehensive home performance testing looks like, as we prove the forever home we built does what we designed it to do. Test instruments used, all available thru https://TruTechTools.com:

• Retrotec 5000 blower door and DM-32 pressure gauge

• Retrotec Flow Box

• Hikmicro M30 infrared thermal camera

• TEC DG-8 pressure gauge

• TEC TruFlow Grid

• HOBO MX1101 temp/humidity datalogger

• Testo 400 large vane anemometer

Watch the whole episode: https://homediagnosis.tv/episode-213-proof-testing-the-house

Chef-Level Home Kitchen? Chef-Level Exhaust Hood. Don't Be Lame.

From 'Home Diagnosis' Season 2 Ep7: For all of us upping our home kitchen game, it's important to be reminded that the most important piece of equipment in the kitchen, and in fact in the entire air quality system of the home, is the kitchen exhaust hood. Don't let your kitchen designer or your glossy home makeover magazine tell you different. See the entire episode at: https://homediagnosis.tv/episode-207-slow-burn See our own home's Ultimate Kitchen Exhaust System: https://buildingperformanceworkshop.com/blog/2021/5/15/how-to-design-install-and-test-a-perfect-kitchen-exhaust-and-make-up-air-system

Join our Patreon team and become part of our exploration of the Science of Homes: https://Patreon.com/HomeDiagnosisTV

Home Improvement FAILS: Things to Avoid Wasting Money On

From 'Home Diagnosis' Seaon 2 Ep 6: lots of companies are selling you lots of things that will 'make your home better'. As we all know, marketing and science are not the same thing- so here are a few tricks to watch out for: new windows, water heater insulation wrap, heat strips, and attic fans. Watch the whole episode: https://homediagnosis.tv/episode-206-windbreakers-air-sealing-and-insulation

Join our Patreon team for as little as $5/month and be part of our exploration of the science of homes! https://Patreon.com/HomeDiagnosisTV