Price is the first obvious variable to consider. It is almost always cheaper to refinish your floor than to replace it. When replacing, you must consider the cost of the new wood as well as the installation. You can offset much of this cost by installing the floor yourself, but this is a very invasive process that requires specialized knowledge and precision. You can typically refinish a wood floor yourself, with just a few inexpensive solutions. Denver Hardwood Flooring
"Click" or Woodloc systems: there are a number of patented "click" systems that now exist. These click systems are either "unilin" or "fiboloc" A "click" floor is similar to tongue-and-groove, but instead of fitting directly into the groove, the board must be angled or "tapped" in to make the curved or barbed tongue fit into the modified groove. No adhesive is used when installing a "click" floor, making board replacement easier. This system not only exists for engineered wood floors but also engineered bamboo and a small number of solid floors (such as "parador solido click") and is designed to be used for floating installations. It is beneficial for the Do-It-Yourself market. Hardwood Floor
Installing a hardwood floor yourself can save you money – if you know what you’re doing. Improper preparation and installation can lead to warping and buckling, which will ruin flooring that would otherwise remain beautiful for years to come. The most important thing you can do to ensure the structural integrity of your floor is to properly prepare for the installation process. Here are various articles to help you!
Installing new solid or engineered hardwood flooring will add value and elegance to your home. Although they offer the same timeless look and sense of warmth, engineered hardwood and solid hardwood do offer a few key differences. For example, engineered hardwood is manufactured from three or more layers of fiberboard, and a real hardwood veneer top layer. Contrastly, solid hardwood is milled from a real hardwood species, making it the sole material used in this type of flooring. Learn more differences here!
It is difficult to compare solid wood flooring to engineered wood flooring due to the wide range of quality in both product categories, particularly engineered. Solid wood has some limitations. Recommended maximum widths and lengths are typically 5" / 127mm wide and 7' / 2100mm long. Solid hardwood is also more prone to "gapping" (excessive space between planks), "crowning" (convex curving upwards when humidity increases) and "cupping" (a concave or "dished" appearance of the plank, with the height of the plank along its longer edges being higher than the centre) with increased plank size. Solid wood cannot be used with underfloor radiant heating. However extra care is necessary with the planning and installation of the heating system and the wood flooring, such as limiting the temperature to 85 °F (29 °C), avoid sharp temperature fluctuations, utilizing an outdoor thermostat to anticipate heating demands, and monitoring the moisture content for the subfloor before installation. Denver Hardwood Floor
Solid hardwood floor planks are made from a piece of wood and made to be anywhere from 18 to 20 mm thick. The boards are made with a tongue and groove to fit together for installation. Depending on the species of wood, certain floors will be harder than others. The harder the floor, the less susceptible it is to dings and scratches. The floor can be sanded and refinished several times to restore its beauty, with the total number of times being determined by the depth of the tongue from the top of the plank. Denver Hardwood Flooring
There are some characteristics that are common to each category: solid wood is more frequently site-finished, is always in a plank format, is generally thicker than engineered wood, and is usually installed by nailing. Engineered wood is more frequently pre-finished, has bevelled edges, is very rarely site-finished, and is installed with glue or as a floating installation. 
Make cuts perpendicular to the direction the wood is laying. Using a circular saw, make single cuts straight across the flooring that are about 1 foot (30 cm) to 2 feet (61 cm) apart. Be sure your cuts are perpendicular to the direction of the wood. Start on 1 side of the room and work your way systematically to the other side, spacing each cut about 1 foot (30 cm) to 2 feet (61 cm) apart. Denver Hardwood Flooring
Judy – I’m sorry to hear this. I am surprised, but it does happen once in a while. I would probably get a 2nd opinion just to make sure. If they were solid hardwood and are now too thin, then it sounds like they’ve been refinished many times. Generally solid hardwood flooring is 3/4″ thick and that is what you should get if you put in anything new. That will then last a long time and you won’t have this issue in the future. Denver Hardwood Floor
Visual – While hardwood flooring is limited by species and stains, Rigid Core flooring has near limitless options when it comes to flooring that looks like wood. In addition to traditional wood visuals and colors, you can pick from stone looks and even hybrids that marry wood and stones together into unique new options. And best of all you will benefit from a curated look that removes unwanted imperfections like oversized knots, holes, and worming that naturally occurs in hardwood floors. Denver Hardwood Flooring
Choose your replacement hardwood flooring. You don't have to replace your old floor with the exact same wood or flooring type that you just removed! You can glue your new hardwood flooring into place if you like. You can also install nail-down, floating (or locking) hardwood flooring as a replacement. The choice is up to you and what your budget allows. Denver Hardwood Floor Install
If your only goal is to brighten your floors and restore their original shine, consider refinishing them. But if you want to change some aspect of the floor itself, like the style of the wood, the direction of the planks or the consistency of the material, you will need to invest in a full replacement. Refinishing is ideal to restore existing wood, while replacement is ideal for establishing a completely new look or feel.
My advice is to bring in a professional to make sure the floors can be refinished (i.e. if there is still enough room/if you didn’t permanently damage the wood), and if so, have them refinish them rather than replace them – that will be much less expensive. I don’t know where you live and the going rates, but in our area, it’s prob. the price is prob. $1-2 lower…but that may be par for your area. Call in 2-3 people to see. I would check Angie’s List (angieslist.com) for some good local people in your area. Denver Hardwood Flooring
Glue down engineered hardwood, alternatively. If you don't want to nail down the boards, you do have the option of using adhesive to put engineered hardwood in place. It's a good choice, but won't last as long or be as sturdy as nailed down hardwood. The procedure is very similar to the nail-down process. Follow the adhesive manufacturer's instructions for installation and drying times. Hardwood Floor