SavingThe PlanetOne HouseAt A Time

G r e e n E a r t h E q u i t i e s . C o m © 2010

Manual J ... The Easy WayWhen do I need it?How much detail?

How does it relate to my Scope Of Work?

Can I contract it out?Is it the gospel truth?

The whole truth?Are there shortcuts?

When can I take them?Easy, Medium, Hard,Which one’s for me?

(This is not the Easy Way... But it’s good to

understand)

SavingThe PlanetOne HouseAt A Time

G r e e n E a r t h E q u i t i e s . C o m © 2010

Before we begin...

What’s happening here?

(It was mentioned last week as a Change Order)

Rogelio sends me stuff like this from his iPhone so 3000 miles doesn’t matter.

SavingThe PlanetOne HouseAt A Time

G r e e n E a r t h E q u i t i e s . C o m © 2010

Owner Requested and Paid Change Order

Wall Removal and Stove Relocation

Couldn’t go overhead as the new gas stove is in an island = Had to cut the concrete.

SavingThe PlanetOne HouseAt A Time

G r e e n E a r t h E q u i t i e s . C o m © 2010

Questions From Last Week

Fireplace?

Mini SplitHeat Pump?What Size?Even with 2Room Adds?How about a

GarageConversion?Still 2 ton?

How can we reduce the heat load?

Concealed Unit or Wall

Mount?

Ducts Inside Envelope or in

the Attic?

Buyer wants

changes?

How much can a 2 ton do?

1 zone or 2?

How bad is “Oversizing?”

When to keep old equipment?

Does a Room Add

makes sense?

Manual J?Manual D?

Western Exposure?

Low E 140?

Change Order?

How tight can we get this one?

Need an ERV-HRV?

Rigid Insulation?

SavingThe PlanetOne HouseAt A Time

G r e e n E a r t h E q u i t i e s . C o m © 2010

Shows total square

footage.

Newest (owner’s) plan is to convert the garage

Garage only = 361

Total = 1700

SavingThe PlanetOne HouseAt A Time

G r e e n E a r t h E q u i t i e s . C o m © 2010

N Note: No Windows on East, Few on West

SavingThe PlanetOne HouseAt A Time

G r e e n E a r t h E q u i t i e s . C o m © 2010

SavingThe PlanetOne HouseAt A Time

G r e e n E a r t h E q u i t i e s . C o m © 2010

Infiltration

Floors

Ceiling

Doors

Walls

Glazing

Ducts

Internal Gains

Ducts

InfiltrationCeilings

Doors

Glazing

Walls

AnySurprises?

Internal gains are growing annually

....A big area

for homeowner education

SavingThe PlanetOne HouseAt A Time

G r e e n E a r t h E q u i t i e s . C o m © 2010

HTM =Heat

TransferMultiplier

Every Building

Component has one

SavingThe PlanetOne HouseAt A Time

G r e e n E a r t h E q u i t i e s . C o m © 2010

SavingThe PlanetOne HouseAt A Time

G r e e n E a r t h E q u i t i e s . C o m © 2010

Room by Room

& Component

by Component

SavingThe PlanetOne HouseAt A Time

G r e e n E a r t h E q u i t i e s . C o m © 2010

SavingThe PlanetOne HouseAt A Time

G r e e n E a r t h E q u i t i e s . C o m © 2010

SavingThe PlanetOne HouseAt A Time

G r e e n E a r t h E q u i t i e s . C o m © 2010

SavingThe PlanetOne HouseAt A Time

G r e e n E a r t h E q u i t i e s . C o m © 2010

Your HVAC contractor should provide this type of

report for you ... Just as your realtor should provide you

with the CMA.

But for quick reference, let’s look at an easier way to do

Manual J

And see how close to the same answer we get ...

SavingThe PlanetOne HouseAt A Time

G r e e n E a r t h E q u i t i e s . C o m © 2010

SavingThe PlanetOne HouseAt A Time

G r e e n E a r t h E q u i t i e s . C o m © 2010

Blan

k Te

mpl

ate

Fill

in Y

ello

w ..

. The

Res

t A

uto

Cal

cula

tes

SavingThe PlanetOne HouseAt A Time

G r e e n E a r t h E q u i t i e s . C o m © 2010

Instructions for using the Load Calc

SpreadSheet

They are in the cells

immediately to the right of

the main sheet

SavingThe PlanetOne HouseAt A Time

G r e e n E a r t h E q u i t i e s . C o m © 2010

Now go live to the Load Calc SpreadSheet.

Let’s see how easy it is to tell if a 2 ton mini split will do

the job!

(2 ton is the smallest they

make.)

SavingThe PlanetOne HouseAt A Time

G r e e n E a r t h E q u i t i e s . C o m © 2010

SavingThe PlanetOne HouseAt A Time

G r e e n E a r t h E q u i t i e s . C o m © 2010

Let’s see which questions were

answered by doing the Manual J

Calculation

Can you identify where

Manual J addressed

each question?

SavingThe PlanetOne HouseAt A Time

G r e e n E a r t h E q u i t i e s . C o m © 2010

Fireplace?

Mini SplitHeat Pump?What Size?Even with 2Room Adds?How about a

GarageConversion?Still 2 ton?

How can we reduce the heat load?

Concealed Unit or Wall

Mount?

Ducts Inside Envelope or in

the Attic?

Buyer wants

changes?

How much can a 2 ton do?

1 zone or 2? How bad is “Oversizing?”

When to keep old equipment?

Does a Room Add

makes sense?

Manual J?Manual D?

Western Exposure?

Low E 140?

How tight can we get this one?

Need an ERV-HRV?

Rigid Insulation?

Always? 2

Always In Writing, Paid For Up Front

Not as bad as once thought... Especially

with inverter technology It’s Gotta Go!Always In Writing,

Paid For Up Front5-10 yrs old But

dont even consider the ducts.

J for equipmentD for DuctsTwice the load

as North

Build so that you always need Ventilation

ON Purpose

Address each component & maximize

it’s efficiency

Especially on West and East Expsure

Good load reduction especially on east and west. Also reduce leaks

We’re shooting for.5 cfm50 per square

foot of floor

Wall mount would be even more

efficient. No duct loss

Could reduce load even more with ducts inside

We think soSo did our buyer

This one, 1700 sf still has 20% extra

capacity

SavingThe PlanetOne HouseAt A Time

G r e e n E a r t h E q u i t i e s . C o m © 2010

Manual J ... The Easy WayWhen do I need it?How much detail?

How does it relate to my Scope Of Work?

Can I contract it out?Is it the gospel truth?

The whole truth?Are there shortcuts?

When can I take them?Easy, Medium, Hard,Which one’s for me?

Always, Unless you are building so tight that the smallest unit is still too big. Still a good idea

After answering the big question, the detail is needed for room to room air delivery

Yes, HVAC Sub

Dont guess, Improve the envelope or the equipment

Sort of. There are other ways and other factors.

Fudge factors and safety factors are built in.

Yes but it’s good to know the old school way

It’s America

You Choose