330 lines
12 KiB
Markdown
330 lines
12 KiB
Markdown
---
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title: '{{ document_title }}'
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author: '{{ author_name }}'
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date: \today{}
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mainfont: DejaVu Sans
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documentclass: article
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fontsize: 12pt
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# NOTE: The applegreen is a custom color defined in resources/head.tex
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linkcolor: applegreen
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urlcolor: applegreen
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abstract: |
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**Prepared For:**
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{{ customer.name }}
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{{ customer.address.street }}
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{{ customer.address.city }}, {{ customer.address.state }} {{ customer.address.zip }}
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```{=latex}
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\begin{center}
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```
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<!-- below are just forced line breaks -->
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\
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\
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\
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[{ width=30% }]({{ company.website }})
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```{=latex}
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\end{center}
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```
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---
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<!-- NOTE: Table of contents section only needs changed if new sections are
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added.
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-->
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# Contents
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1. [Introduction](#home-performance-report)
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1. [Your Goals](#your-goals)
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1. [Leakage](#how-leaky-is-your-house)
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1. [Which Areas Leak The Most](#which-areas-leak-the-most)
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1. [Observations](#observations)
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1. [HVAC](#hvac-observations)
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1. [Home](#home-observations)
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1. [Load Calculations](#load-calculations)
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1. [Your Loads](#your-loads)
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1. [Airflow Assessment](#airflow-assessment)
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1. [Your Static Measurements](#your-static-measurements)
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1. [Static Pressure Forecast](#static-measurements-forecast)
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1. [Summary](#summary)
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1. [Definitions](#definitions)
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1. [CFM50]
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1. [IAQ]
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1. [LAIR]
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1. [Load Calculation][load-calculation]
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1. [Shell][shell]
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1. [SHR]
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1. [TESP]
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1. [WC][wc]
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# Home Performance Report
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Thank you for having us to your home for a home performance assessment. I hope that it was beneficial. We learned a lot
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about your home and your goals during the brief visit. So, let’s jump in to some of the things discovered.
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Below is a summary of your goals, house measurements, and our budget discussion as well as my observations and some
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recommendations. As part of the service we ran load calculations that help determine the right sized HVAC for your home
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as it stand and with some upgrades. Those are attached as are bids for replacements.
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Once you read the report you’ll have 3 options: do nothing, pick and choose upgrades, or do more planning for more
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difficult goals or complex projects. These options are discussed at the end of the report as well as our leanings for
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your home.
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```{=latex}
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\begin{center}
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```
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{width=50%}
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```{=latex}
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\end{center}
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```
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## Your goals:
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<!-- NOTE: This should probably be a table in most cases, with a rank.-->
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<!-- WARNING: Add goals here -->
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| Goal | Rank |
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| ---- | ---: |
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\newpage
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# How Leaky Is Your House
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<!-- NOTE: Several of the variables used in this section are defined in vars.sh
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Do not change them here, instead update them in the vars.sh file.
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-->
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One of the main objectives was to perform a blower door test and load calculations for the home. We discovered that the
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blower door number was {{ home.cfm50 }} [CFM50] for the approximately {{ home.square_feet }} \squarefoot
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({{ home.lair }} [LAIR]). A leaky home, most often, is an uncomfortable and uncontrollable home.
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> _Air leakage tends to have one of the largest impacts on the load of a home._
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>
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> - _Around 1:1 homes begin to be more controllable / comfortable_
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> - _your home is {{ home.cfm50 }}:{{ home.square_feet }} \squarefoot for a ratio of {{ home.lair }}_
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> - _Leaky homes are very difficult to maintain comfort with HVAC alone._
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{width=80%}
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\newpage
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## Which Areas Leak The Most
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While on site, zonal pressure diagnostics were performed to determine which areas leak the most. Below is a table
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summary of the areas with the most room for improvement.
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<!-- WARNING: Add zonal pressures here. -->
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| **Room** | **Zone Pressure** | **Connection to Outside** |
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| -------- | ----------------: | ------------------------: |
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> **NOTE:**
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>
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> _We use a simplified equation for connection to outside, the actual leakage calculations are beyond the scope of our
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> consult. The simplified equation is generally a decent representation in most scenarios._
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\newpage
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# Observations
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The below sections are observations about the current HVAC system and the home.
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## HVAC Observations
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<!-- WARNING: Add HVAC observations here. -->
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1. Current furnace is sized appropriately based on the load of the home.
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1. Current duct system is not sized adequately for the system.
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1. Filter is too small for the system.
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1. Return sizing is not adequate.
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1. Supply sizing is marginal.
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1. Current static pressure is already high.
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1. These problems may become worse when AC is installed.
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## Home Observations
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<!-- WARNING: Add house observations here. -->
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1. The house leakage is high for the size of the home.
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1. May be hard to control comfort without [shell] improvements.
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\newpage
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# Load Calculations
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Several [load-calculations][load-calculation] were performed on your home to determine the proper equipment sizing for
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this application. Below is a comparison of the [load-calculations][load-calculation] with the current air leakage and
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several improved air leakage targets.
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## Your Loads
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<!-- WARNING: Add the project loads here. -->
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| [CFM50] | | Heating Total | Cooling Total | [SHR] | [LAIR] |
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| -------------------- | ----------- | ------------- | ------------- | -------- | ------------------- |
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| **{{ home.cfm50 }}** | **Current** | **55,102** | **20,726** | **0.79** | **{{ home.lair }}** |
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| 2,000 | | 40,320 | 17,279 | 0.85 | 1.5:1 |
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| 1,350 | | 35,885 | 16,245 | 0.88 | 1:1 |
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> **Note:**
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>
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> 1. _The lower the heating and cooling total's the better._
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> 1. _An undersized air conditioner is better than an oversized one._
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> 1. _Supplemental dehumidification may be required for [SHR]'s below 0.83._
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The above table shows the relationship between air leakage and the amount of heating and cooling that is required for
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the home. A tight home is easier to control the comfort levels, offers superior IAQ levels, and lower utility costs.
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<!-- WARNING: Update this summary for the given project -->
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The projected cooling size required for your home is around 2-Tons for the current leakage rate, or 1.5-Tons if [shell]
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improvements were made.
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[Here is a link to your load calculation reports][loads-folder]
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\newpage
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# Airflow Assessment
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While on site, we also measured the total system airflow and static pressure of the system. Static pressure is
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equivalent to the blood pressure of your system and gives us a better understanding of the overall ability for the
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system to provide the proper amount of airflow, as well as how much it may struggle to do so.
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Static pressure is the amount of resistance that the blower has to work against in order to move air through the system.
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Things that have an effect on the static pressure of the system include, air filters (size and type), duct sizes, amount
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of ducts, length of ducts, duct fittings and transitions, as well as internal system components. Each component of the
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system has a resistance associated with it that the blower has to overcome, by taking some key measurements we are able
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to determine the [TESP] of the system. While there are several static pressures in the system, when we talk about static
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pressure we are generally referring to [TESP].
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Static pressure ([TESP]) has a range of _low_, _acceptable_, or _high_. While these numbers are specific to the actual
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equipment, most manufacturers follow similar standards. For the sake of simplicity, 0.5" [wc] or under is an
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_acceptable_ target, 0.8" [wc] is generally the max acceptable static pressure (although we like to stay well below this
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if possible), and above 0.8" [wc] is considered _high_ and should be addressed. _Low_ is generally not common and is
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rarely problematic, so it is not focused on much.
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<!-- NOTE: Force a new page here, for images and sub-section heading to be on same page -->
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\newpage
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## Your Static Measurements
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{height=50%}
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<!-- WARNING: Summarize the static measurements here -->
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The above image is a snapshot of the static pressures recorded for your system. This shows that the static pressure of
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your system is very high (1.114" [wc]). The primary culprits for the high static pressure are that the filter is
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undersized for the airflow required and the return duct sizing is small.
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These measurements were taken in the heating mode because your system does not currently have air conditioning.
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Currently the heating airflow is on the low side for what is required for your system (1200 CFM would be ideal). This
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should be adjusted if possible during the install to get better performance and efficiency out of the system, given that
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some static pressures can be improved during the project.
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\
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\
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[Here is a link to the full airflow report.][trueflow-file]
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<!-- NOTE: Force a new page here, for images and sub-section heading to be on same page -->
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\newpage
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## Static Measurements Forecast
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{height=50%}
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<!-- WARNING: Summarize the forecast results below. -->
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The above image is a snapshot is of a forecast of the static pressures after adding air conditioning. It should be noted
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that these measurements are based solely on the airflow required for cooling mode, not for heating mode (in other words,
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heating mode is going to be higher because the airflow requirement is higher).
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This shows that with an upgraded filter we can get the static pressure below the 0.8" [wc] max target while in cooling
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mode.
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\
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\
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[Here is a link to the full forecast report.][trueflow-forecast-file]
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\newpage
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# Summary
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The purpose of the home performance assessment is to help find the overlap between the house needs, the goals, and the
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budget to see if there's a viable project.
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<!-- WARNING: Add summary here -->
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The house is pretty leaky overall. This is due to the age and construction style of the house. This may lead to comfort
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problems or trouble maintaining comfort in all areas of the house.
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Based on the [load calculations][load-calculation], the previously quoted systems are too large for the current load, so
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we need to update the proposals to be for 2-Ton systems. This will help with the fact that the static pressure of the
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system is already really high. The static pressure for heating will likely still be above the 0.8" [wc] max threshold.
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An upgraded air filter is going to be required to help alleviate the blower motor. Another return may be required in the
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living space to further drop the static pressure, however this could likely be done in the future if desired. I would
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estimate that adding another return would be in the **$800-1,200** range.
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While on site it was mentioned that you would like some of the ducts to be sealed that go to the second floor. This is
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something that is not included in our general proposals. I would estimate this to be an additional **$150-300** and will
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add options in the updated proposals.
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Since the goal is to add air conditioning, then I would recommend going with a 2-Ton system. If the system does not
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maintain then you could look into [shell] improvements and air sealing the home.
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Regards,
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\
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\
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\
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[Here is a link to all the documents][document-folder]
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<!-- prettier-ignore-start -->
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<!-- NOTE: These are reference links for short form linking in the document.
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This allows all the links to be changed / updated in one place.
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However most do not need updated unless sections are added, besides the
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document links, which are defined / setup in vars.sh.
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-->
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[CFM50]: #cfm50-definition "CFM50"
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[IAQ]: #iaq-definition "IAQ"
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[LAIR]: #lair-definition "LAIR"
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[load-calculation]: #load-calculation-definition "load calculation"
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[shell]: #shell-definition "shell"
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[SHR]: #shr-definition "SHR"
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[wc]: #wc-definition "wc"
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[TESP]: #tesp-definition "TESP"
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<!-- IMPORTANT: Take screen shots of the TrueFlow reports and add to the img
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folder with names / path setup in vars.sh -->
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<!-- default is img/trueflow.png -->
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[trueflow-image]: <{{ links.images.trueflow }}>
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<!-- default is img/forecast.png -->
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[trueflow-forecast-image]: <{{ links.images.trueflow_forecast }}>
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<!-- NOTE: These links are defined in vars.sh -->
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[loads-folder]: <{{ links.documents.loads_folder }}>
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[trueflow-file]: <{{ links.documents.trueflow_file }}>
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[trueflow-forecast-file]: <{{ links.documents.trueflow_forecast_file }}>
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[document-folder]: <{{ links.documents.document_folder }}>
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<!-- prettier-ignore-end -->
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```
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```
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