HVAC performance
This page is not going to tell you whether to replace your air conditioner. Duct Daddy does not diagnose mechanical HVAC failures and is not trying to replace the role of a qualified HVAC service technician — that judgement belongs to a licensed contractor who has examined your equipment.
What this page can do is help you separate four different kinds of problem that produce similar complaints, because the most expensive mistake in this category is replacing equipment to solve something the equipment was never causing.
Before spending thousands of dollars on a replacement for a comfort complaint, it is reasonable to understand whether the duct distribution system is contributing to the problem.
Reviewed by Duct Daddy
Written and reviewed by the Duct Daddy team, a duct leakage testing and duct sealing specialist serving Southeast Louisiana. This article is general guidance, not a diagnosis of your system.
Symptoms that call for qualified HVAC service: the system will not start, short-cycles, trips breakers, ices up, makes new noises, produces air that is not noticeably cool, or has degraded suddenly. A licensed HVAC service technician diagnoses these. Age and repair history legitimately factor into a replacement decision.
Testing quantifies how much air the duct system loses and can indicate whether losses are concentrated on the supply or return side. Leakage typically shows up as broadly weak delivery, rooms at the end of long runs suffering, long runtimes and humidity that does not match the equipment's apparent health.
Undersized branches, inadequate return air, too many takeoffs on one trunk, or a system extended through renovations. Sealing will not solve these. They need modification, and knowing that before a replacement quote is signed matters, because new equipment attached to a limiting duct system inherits the limitation.
Insulation shortfalls, air leakage at the attic plane, glazing and solar gain. Here the problem exists outside the HVAC and duct systems entirely, and neither new equipment nor duct sealing addresses it.
Duct Daddy specialises in duct leakage testing and duct sealing. We do not perform mechanical HVAC repair, refrigerant work or equipment replacement. Contact a qualified HVAC contractor if any of the following apply:
Of the four categories above, duct leakage is the one that produces a number. That makes it a useful thing to resolve early, because it either removes a variable or identifies a problem the equipment replacement would not have fixed.
Duct leakage is one of the few items on this list that can be measured rather than estimated. A duct leakage test pressurises the duct system and quantifies how much air is escaping, so the duct system either is or is not part of your problem — and you have a number either way.
Duct Daddy works as a specialty third-party provider alongside HVAC companies. A measured duct report is useful to your contractor whether or not we do any sealing work.
More detail on the process: how air duct sealing works and how leakage is measured and verified.
Get a measured picture of the duct system before a replacement decision is made on assumption.
New equipment is usually connected to the existing duct system. Here is what a replacement does and does not change.
Three different scopes that get talked about as one. Which one a duct system needs depends on what is wrong with it.
Long runtimes are not automatically a fault — here is how to tell the difference between working hard and losing air.
Browse every guide in the comfort guide.
Schedule a duct leakage evaluation and get measured numbers for your home — not a guess.
