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Here are what I used to do. Been awhile but I don't think I left anything out.
http://www.comfort-calc.net/tech_area_index.htm#Service and look for annual service

Another option is make your steam system more efficient.This usually is not hard to do.I know jobs where the fuel savings was a s high as 20 - 25%.
Evaluate the system a bit and see what you can do....

If you are not currently operating a power attic fan through the roof I strongly advise it. Resolve the a/c problem but add the fan anyway. I have had situations with similar problems and the fan...

Your test result numbers are way off. I bet the noise is on start-up with an 8% C02.
The blower probably needed new bearings and shaft if it is belt drive. Many newmacs were beltdrive back than. BTW...

Summer is coming. Hold off and tighten up that home reducing the heat loss before you have a new unit installed and buy smaller equipment. This will be your greatest savings. Many homeowners install...

Homeowners beware. Any contractor that does not do a heat loss or heat gain should not be installing equipment! We are wasting so much of our natural resources by oversizing equipment and nobody...

I would guess your boiler is 5 times over sized. Big waste of fuel. Rip it out the first sunny day and replace. A good 85% or mod/con is good with OD reset with either decision. One you know the heat...

It all comes down to money and Bulls**t and but kissing to get funds call lobbyists. It seems Penn State has falsified files. Is it me or have we heard more about politicians going bad in the last...

As Beenthere stated the hard part if this is a cast iron boiler will be boiler protection. The resistance will be low in your system. Usually the circulator that came with the boiler is enough flow....

I really doubt this is an air problem. It may be a flow issue. I assume this only happens at higher water temperatures. How much fresh water is being added to the system? Turn off the make-up water...

Almost all the equipment to day wants a boiler bypass installed with large water volume systems. The idea is to protect the boiler and not affect system flow use a boiler bypass diverting water...

The fuel consumption will be increased with age due to an efficiency decrease but the actual btu output will not change much. There is no reason to add anything to the heat loss to cover this. There...

OK, time for my two cents which is only worth about a penny today. When setback thermostats were designed they were designed for loose construction homes. The homes had higher heat losses per sq ft...

If the unit was installed in the seventies I am sure it is over sized. Out of the existing heating equipment I would guess there is maybe 5 or 6 in this great nation that might be properly sized....

Unless you want to, I would not change the radiation. Do the heat loss and determine the amount of radiation as compared to the heat loss at hot water temperatures to see if the radiation is large...

I am from Harrisburg and I want to tell you this is a huge undertaking that may create many problems. All the info you already received is good info. I would like to add if you have wet returns...

What makes you think any company would change the ductwork for free. There is no Obama care for duct systems.
I think what everyone is saying is that what ever you do other than fix the ductwork,...

It is all about the boiler being sized to the radiation and not the existing boiler. The near boiler piping is critical. NO cutting corners here. As stated before you need a contractor that knows...

My friend you are opening a can of worms with this question. Everybody has an opinion. I don't feel you will benefit from a mod/con (modulating/condensing) boiler as much as you may from a properly...

I also believe all boilers are as good as the installation. To answer the question about CI boilers vs mod/con boilers it depends on the installation. A heat loss is needed number 1. Than calculate...

There should be a control on the boiler made by Homeywell. Take the cover off and there may be three red knobs in there. Where are the pointers pointing? If there are not red knobs there are three...

The units also sound too large for me. 9 ton of cooling for about 4800 sq ft. Maybe put some glass in holes which used to be windows to reduce the heat gain. Just kidding of course. I have seen many...

What are the control settings. There should be a low limit, high limit and a differential setting.
The coil should be able to supply you the rated gallons all day long.

Here is the skinny you have been waiting for. The warranty is on the product, period. I am not sure the manufacturer cab even void the warranty even if the home owners buy and installs himself. That...