Greetings!
Since calculations are involved, I would recommend implementing it in MS Excel. If MS Excel is used, it would provide great flexibility over time - either when calculations have to be changed or when dealing with changes in Appliances used section. The look and feel would be the same as in Word document.
Being a full time freelancer working exclusively on Excel based projects, I work on developing such MS Office based solutions every single day.
I have 18 years experience in using Excel as part of my daily work life. Over the last 24 MONTHS , I have spent at least 250 HOURS on automation in Excel every month.
If awarded, I can get your work completed to your fullest satisfaction.
Have a Great Day!
Srinivasan Krishnamoorthi